Sexual selection

In a previous post, I discussed the fact that although all of us have the identical set of ancestors who lived just 5,000 years ago, this does not mean that we have the same genes. The fact that we are different is due to the fact that if most of the mating occurs within a group, then this can result in certain features becoming emphasized. In extreme case, this initial isolated mating pattern can result in a new species being formed that cannot mate with other groups that it could have done in the past.

I had always thought that the two organisms belonged to different species if they were biologically different enough that they either could not produce offspring or, as in the case of mules produced by horses and donkeys, the offspring were infertile and thus not able to reproduce.

But I learned from Richard Dawkins’ book The Ancestor’s Tale (2004) that two things can be considered different species even if they are perfectly capable of producing fertile offspring. All that is required for them to be considered to be different species is that they are not found to mate in the wild for whatever reason.

Normally, this happens when there is some kind of barrier that separates two groups of the same species so that they cannot mate. “No longer able to interbreed, the two populations drift apart, or are pushed apart by natural selection in different evolutionary directions” (p. 339) and thus over time evolve into different species. But the separation can also occur due to sexual selection.

He gives a fascinating example of this on page 339. He describes experiments done with two species of cichlid fish. The two species live together in Lake Victoria in Africa and are very similar, except that one has a reddish color and the other bluish. Under normal conditions, females choose males of the same color. In other words, there was no hybridization between the two colors in the wild, thus meeting the requirements for being considered different species. But when experimenters lit the fish in artificial monochromatic light so that they all looked dirty brown, the females no longer discriminated among the males and mated equally with both kinds of males and the offspring of these hybrids were fully fertile.

He also describes ring speciation using the example of the herring gull and lesser black-backed gull (p. 302). In Britain, these two kinds of birds don’t hybridize even though they meet and even breed alongside one another in mixed colonies. Thus they are considered different species.

But he goes on to say:

If you follow the population of herring gulls westward to North America, then on around the world across Siberia and back to Europe again, you notice a curious fact. The ‘herring gulls’, as you move around the pole, gradually become less and less like herring gulls and more and more like lesser black-backed gulls, until it turns out that our Western European lesser black-backed gulls actually are the other end of a ring-shaped continuum which started with herring gulls. At every stage around the ring, the birds are sufficiently similar to their immediate neighbors in the ring to interbreed with them. Until, that is, the ends of the continuum are reached, and the ring bites itself in the tail. The herring gull and the lesser black-backed gull in Europe never interbreed, although they are linked by a continuous series of interbreeding colleagues all the way around the other side of the world.

Dawkins gives a similar example of this kind of ring speciation with salamanders in the Central Valley of California.

Why is this interesting? Because it addresses a point that sometimes comes up with skeptics of evolution. They try and argue that there is a contradiction if we had evolved from an ancestor species that was so different from us that we could not interbreed with that species. Surely, the argument goes, doesn’t speciation imply that if species A evolves into species B, then must there be a time when the child is of species B while the parent is of species A. And isn’t that a ridiculous notion?

The herring gulls and salamanders are the counterexamples in space (which we can directly see now) of the counterargument in time (which we can only infer). What it says is that as descendants are produced, they form a continuum in time. Each generation, while differing slightly, can interbreed with its previous generation, but over a long enough period of time, the two end points of the time continuum need not be able to interbreed.

Thus it is possible for an organism to be intermediate between two species.

Coming back to the question of why we look so different if we all shared common ancestors so recently, it is likely that the kind of selectivity practiced by the cichlid fish has resulted in certain features being shared by groups that interbreed within a restricted domain bounded by distance and geography and culture, although the process has not become so extreme that we have formed into distinct species.

I apologize for boring those readers who had had a much more extensive biology education than I have because all these things which I have been writing about recently on evolution must be well known to them. But I find all this perfectly fascinating and novel.

POST SCRIPT: Amy Goodman in Cleveland

Award-winning journalist Amy Goodman, host of the daily, grassroots, global, radio/TV news hour Democracy Now!, is on a national speaking tour to mark DN!’s 10th anniversary and launch her second book with journalist David Goodman, Static: Government Liars, Media Cheerleaders, and the People Who Fight Back.

WHEN: Saturday, October 14th, 7:00-8:30 PM
WHERE: Student Center,
John Carroll University,
20700 N. Park Blvd (University Heights), Cleveland, OH
DESCRIPTION: Amy Goodman speaks at a free event at the Student Center. Book signing to follow. Members of Iraq Veterans Against the War will give a brief presentation before the talk, as part of their collaboration with the Uprise Tour.
TICKETS: Free
MORE INFO: See here for directions.

Why we look different despite having identical ancestors

In the previous post in this series, I reported on a paper by Douglas L. T. Rohde, Steve Olson, and Joseph T. Chang and published in the journal Nature that said that if we go back about 5,000 years, the ancestors of everyone on Earth today are exactly the same. This date is called the IA point, where IA stands for ‘identical ancestors’.

One question that will immediately arise in people’s minds is that if all our identical ancestors lived so recently, how is it that we look so different? If you take four people from China, Sri Lanka, Sweden, and Malawi, they are usually fairly easily distinguishable based on physical appearance alone, using features such as skin color, hair, facial features, etc. How could this happen if they all had identical ancestors as recently as 5,000 years ago?

The answer lies in the fact that while it is true that we all share the same ancestors, it does not mean that we all received that same genetic information from that common ancestral pool.

It is true that each of us gets exactly half our genes from our fathers and half from our mothers. But when we pass on our genes to our children, while each child gets exactly half from each parent, that does not imply that they get exactly one quarter from each grandparent. What is true is that on average each child gets one quarter of the genes from each grandparent.

The reason for this is because when a sperm or egg is formed, the genetic information (say in the egg formed in the mother) that goes into it undergoes a process of recombination in which the genes the mother obtained from her parents get mixed up before the transfer into the egg. It is thus theoretically possible, though unlikely, that a child will have zero genetic information from one of her four grandparents.

Furthermore, as we go down to the next generation, the average genetic information received by a child is now just one-eighth from any given great-grandparent. After many generations, even the average contribution of someone to each descendant approaches zero and it is not hard to imagine that some ancestors will have descendants who inherited none of their genetic information. In fact, as Rohde, Olson, and Chang say, “because DNA is inherited in relatively large segments from ancestors, an individual will receive little or no actual genetic inheritance from the vast majority of the ancestors living at the IA point.”

Furthermore, “In generations sufficiently far removed from the present, some ancestors appear much more often than do others on any current individual’s family tree, and can therefore be expected to contribute proportionately more to his or her genetic inheritance. For example, a present-day Norwegian generally owes the majority of his or her ancestry to people living in northern Europe at the IA point, and a very small portion to people living throughout the rest of the world.”

So even though we all have the same set of ancestors, the amount of genetic information received from any one ancestor will vary wildly from person to person.

As long as populations remained largely isolated, they could thus evolve different physical characteristics, although even a tiny amount of migration between populations is enough to create the early common dates of the MRCA (most recent common ancestor) and IA.

There are some factors that could shift those dates back further.

If a group of humans were completely isolated, then no mixing could occur between that group and others, and the MRCA would have to have lived before the start of the isolation. A more recent MRCA would not arise until the groups were once again well integrated. In the case of Tasmania, which may have been completely isolated from mainland Australia between the flooding of the Bass Strait, 9,000–12,000 years ago, and the European colonization of the island, starting in 1803, the IA date for all living humans must fall before the start of isolation. However, the MRCA date would be unaffected, because today there are no remaining native Tasmanians without some European or mainland Australian ancestry.

No large group is known to have maintained complete reproductive isolation for extended periods.

It seems to me that these results arguing for the fact that our most recent common ancestor lived about 2,000 years ago and that we all have the same common ancestors who lived just 5,000 years ago are pretty robust.

This has profound implications for origins myths and tribalism. Some people like to have a sense of racial pride by thinking that they represent ‘pure’ races. This research argues that this view is rubbish. None of us are ‘pure’. We are all cousins, and fairly close ones at that.

The most recent common ancestor of all humans living today

In order to find the date of the most recent common ancestor (MRCA) of all the people living today, Chang started out by constructing a simple mathematical model of population mixing. (See here for some background to this post.)

He assumed that the population is constant over time at some value N. He assumed that the generations are discrete and non-overlapping (i.e. mating took place only between males and females of the same generation). He also assumed that mating was random. In words, that there was equal probability of any one male in a generation to breed with any female of that same generation.
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Some surprising facts about ancestors

In 1999, Joseph T. Chang published a very interesting paper in the journal Advances in Applied Probability (vol. 31, pages 1002-1026) titled Recent Common Ancestors of all Present-Day Individuals. To understand the paper, it helps to reflect a little on the mathematics of genealogy.

One rock-solid fact of ancestry is that every person has two, and only two, biological parents. They in turn each have two parents so going back two generations gives a person four ancestors. If you go back three generations, you have eight ancestors and so on. Each generation that you go back doubles the number of ancestors in the previous generation.

We all know that this kind of geometric progression results in one reaching very large numbers very soon and by thirty generations, the number of ancestors one has acquired has ballooned to over one billion. In forty generations, we have over one trillion ancestors.

Conservatively allowing for each generation to span 30 years (which is a little large), going back thirty generations takes us back to about 1100 CE where the population was only about 300 million, and forty generations takes us back to 800 CE where the population was less than 200 million. (If we take each generation as averaging 25 years, 30 generations takes us back to 1250 CE when the population was 350 million and in forty generations we reach 1000 CE where the population was 200 million.)

Having more ancestors that the total population leads to the clear conclusion (which is not that surprising once one thinks about it) that all our ancestors cannot have been distinct individuals but were shared. In other words, my great-great-great-grandfather on my father’s side had to be the same person as my great-great-grandfather on my mother’s side, or something like that.

But the interesting point is that each one of us has over a trillion ancestors in just forty generations, which must mean that you, the reader, and I must have some shared ancestors, unless the huge population of your ancestors were entirely isolated from the huge population of my ancestors, with no mixing at all between them. Given the large numbers of ancestors involved, this kind of isolation seems highly unlikely unless there was some major geographical barrier separating the populations. We know that this is not the case, since by 1000 CE, people were able to travel pretty much all over the inhabited world, and all you need is just one person from my group of ancestors mating with one person from your group of ancestors to break the isolation, because then the ancestors of that pair are shared by both of us.

So if you and I (as just two people) share common ancestors, then we can see that if we go back far enough in time, all of us living on the world today should share at least some common ancestors. (See this post for a more rigorous argument for this.) One question that Chang was investigating was that of finding out, from among all the common ancestors, when the most recent common ancestor (MRCA) of all the people living in the world today lived.

The concept of the MRCA is interesting. My siblings and I share all our ancestors so the MRCA is not meaningful. The MRCA of my cousins and I (say) are the one set of grandparents that we have in common. As my current relatives get more distant, the MRCA goes back in time but it is not hard to see that an MRCA must exist for those who are commonly referred to as ‘blood’ relatives.

As another example, for those who take the Bible literally, definite common ancestors would be Noah and his wife. Since everyone except the two of them and their sons and their sons’ wives were killed by god in the flood, all the current inhabitants of the world should have Noah and his wife as common ancestors. But they may not be the MRCA because their sons’ descendants may also have intermarried, creating a more recent MRCA.

For those of us who accept evolution, it is not hard to get our minds around the concept of all of us having an MRCA, and the fact that we must have a shared ancestor in an earlier species has a pretty rigorous proof and is fairly easily accepted. What people thought was that this person probably existed around the time of our ancestor Homo erectus, perhaps a million years ago.

But when analysis was done on the mitochondrial DNA, and its mutation rate was used to triangulate back to the time when all the current mitochondrial DNA converged on a single individual, people were surprised that the calculations revealed that the MRCA deduced from this analysis, (nicknamed Mitochondrial Eve) lived much more recently, only about 140,000 years ago, probably in Africa. All present-day mitochondrial DNA is descended from this single individual. A similar analysis can be done for the Y chromosome to trace back to ‘Y-chromosome Adam’, and that person lived about 60,000 years ago (Richard Dawkins, The Ancestor’s Tale (2004), pages 52-55).

But as Dawkins cautions (page 54):

[I]t is important to understand that Eve and Adam are only two out of a multitude of MRCAs that we could reach if we traced our way back through different lines. They are the special-case common ancestors that we reach if we travel up the family tree from mother to mother to mother, or father to father to father respectively. But there are many, many other ways of going up the family tree: mother to father to father to mother, mother to mother to father to father, and so forth. Each of these pathways will have a different MRCA.

Our normal concept of genealogy traces back through both sexes and thus the web of ancestral pathways becomes increases tangled and complex as you go back in time. As a result there is a greater chance of my ancestral pathways intersecting with the ancestral pathways of other people. It is thus reasonable to suppose that if we look at all these pathways, we will find a more recent MRCA than Mitochondrial Eve or Y-chromosome Adam. But this kind of calculation using mutation rates is not easy to do for things other than sex-specific chromosomes like mitochondrial DNA.

In order to try and fix the date of existence of the MRCA of everyone living today using the lines through both sexes, Chang used the tools of mathematics and statistics rather than genealogical charts or DNA mutations. And he found something very surprising, to be discussed in the next posting.

POST SCRIPT: If you live in fear, the terrorists have won

Tom Tomorrow points out the absurdity of people terrorizing themselves.

My ancestor Narmer, the first Pharaoh of Egypt

While doing some research on my ancestors last month, I made the surprising discovery that I am the direct descendent of Narmer, who was the first Pharaoh of Egypt and lived around 3,100 BCE. Narmer (thought by some to be the same person as Menes) was not your run-of-the-mill pharaoh. He is a bona fide Pharaoh Hall of Famer, credited with unifying the land that became Egypt and founding the very first dynasty. Of course, given the poor nature of record keeping back in those days one can never be absolutely certain of such things, but I am 80 percent certain that he is my direct ancestor.

How do I know this? I did not do an actual genealogy chart of my ancestors. It is a curious thing but people in Sri Lanka are nowhere near as enthusiastic about tracing their ancestral roots as the people in the US. I know who my grandparents are and I know some of their siblings but that is about it. I think that may be true for most Sri Lankans. I do not recall ever having discussions with anyone in Sri Lanka where people talked about ancestors farther back than three or four generations. It was not a topic of much interest.

Contrast this with America where people are fascinated with their ancestry and go to great lengths to trace back as far as they can, even hundreds of years. It is not unusual to have a conversation in America and for people to spontaneously raise the topic of where their ancestors came from and how far back they have tracked them. And people here are very excited when they find someone in their past who is famous (or even infamous) or had a role in some major historical event or is even just mentioned in some historical document.

Since thinking about my ancestors last month, I have been pondering why there is such a marked difference in interest in the two countries and have come up with some hypotheses, although I have no idea if these explanations are valid.

One possible explanation is that tracing one’s ancestors in Sri Lanka is likely to be a fairly boring exercise with little expectation of anything exciting turning up. After all, it is a small island nation that has a recorded history of about 3,000 years. I know the village where my paternal grandfather, for example, was born and raised. If you trace back farther you will likely arrive at another person in that same village or a neighboring village. If you go back yet further, it will probably be another person in that same village or region, and so on for generation after generation. The likelihood of finding something really surprising or interesting is small. Pretty boring stuff, hardly worth putting a lot of effort into.

In the US, it is quite different. As one goes back in time, one will fairly soon reach ancestors who came from another continent or came over with the early settlers or were members of a Native American tribe. All of these are sufficiently novel and interesting facts that may make worthwhile the hard work necessary in finding one’s roots.

Another factor is the quality of the recordkeeping as you go back in time. The structure of American and European societies was such that maintaining records was desirable. The fairly early adoption of a mercantilist society, capitalism, and private property ownership meant that you had to know who owned what and, most importantly, who inherited the property when someone died. This required that careful records of births and death be kept. This record keeping was also facilitated by church records. Since churches were institutions that also performed civil functions and married people, baptized their children, and buried them when they died, church records are rich sources of genealogical information.

Countries like Sri Lanka remained feudal until later and in many such societies land was either owned by the local feudal lord or held in common by the villagers, so questions of property inheritance were not major issues. Furthermore, Buddhist and Hindu religions (which are the main religions in Sri Lanka) are much less hierarchical in organizational structure than Christianity, and I believe their clergy do not have the same dual civil/religious role that Christian clergy have when it comes to marriages. So Buddhist and Hindu temples are not repositories of marriage, birth, and death records the way that Christian churches are.

A comprehensive mercantilist and capitalist economy came much later in Sri Lanka than in (say) Europe so one is likely to run up against a genealogical blank wall much sooner there, making the search for one’s ancestors a much more frustrating task. Coupled with the fact that the long history and relatively little migratory behavior, and it is easy to see why tracking one’s ancestors is not a particularly popular endeavor.

Even with good record keeping, tracing one’s ancestors is a time-consuming task, requiring that one spend enormous amounts of time and effort in libraries and other archival institutions, poring over old records, and following many false trails.

In tracing my own ancestors, I did not do any of that laborious detective work. So how is it that by merely sitting lazily at my desk in the US in front of a computer, I could state that I am 80% confident that I, a person of Sri Lankan origin, am in a direct line from the very first pharaoh of Egypt?

That’s the story for the next posting.

POST SCRIPT: Russell’s teapot cartoon

Here is another cartoon from the creator of the blog Russell’s Teapot. His cartoons are also a weekly feature on MachinesLikeUs.

russellteapot2.jpg

Our common ancestors

Darwin’s theory of natural selection implies that we are all descended from common ancestors. Most people who have doubts about the theory tend to think that this is a proposition that we can either choose to accept or deny. After all, no one was around to see it, were they?

But Richard Dawkins’ excellent book The Ancestor’s Tale (2004) gives a surprisingly rigorous argument (on page 39) that back in the distant past, we must have all had common ancestors. He is such a good writer, both stylish and concise, that paraphrasing him would be a waste of time and I will give you an extended quote:

If we go sufficiently far back, everybody’s ancestors are shared. All your ancestors are mine, whoever you are, and all mine are yours. Not just approximately, but literally. This is one of those truths that turns out, on reflection, to need no new evidence. We prove it by pure reason, using the mathematician’s trick of reductio ad absurdum. Take our imaginary time machine absurdly far back, say 100 million years, to an age when our ancestors resembled shrews or possums. Somewhere in the world at that ancient date, at least one of my personal ancestors must have been living, or I wouldn’t be here. Let us call this particular little mammal Henry (it happens to be a family name). We seek to prove that if Henry is my ancestor he must be yours too. Imagine, for a moment, the contrary: I am descended from Henry and you are not. For this to be so, your lineage and mine would have to have marched, side by side yet never touching, through 100 million years of evolution to the present, never interbreeding yet ending up at the same evolutionary destination – so alike that your relatives are still capable of interbreeding with mine. This reductio is clearly absurd. If Henry is my ancestor, he must be yours too. If not mine, he cannot be yours.

Without specifying how ancient is ‘sufficiently’, we have just proved that a sufficiently ancient individual with any human descendants at all must be an ancestor of the entire human race. Long-distance ancestry, of a particular group of descendants such as the human species, is an all-or-nothing affair. Moreover, it is perfectly possible that Henry is my ancestor (and necessarily yours, given that you are human enough to be reading this book) while his brother Eric is the ancestor of, say, all the surviving aadvarks. Not only is it possible. It is a remarkable fact that there must be a moment in history when there were two animals in the same species, one of whom became the ancestor of all humans and no aardvarks, while the other became the ancestor of all aardvarks and no humans. They may well have met, and may even have been brothers. You can cross out aardvark and substitute any other modern species you like, and the statement must still be true. Think it through, and you will find that it follows from the fact that all species are cousins of one another. Bear in mind when you do so that the ‘ancestor of all aardvarks’ will also be the ancestor of lots of very different things beside aardvarks[.]

There is one aspect of this argument that is crucial and that is that our common shared ancestor Henry that Dawkins is talking about has to have lived at a time when he was of a different species from us, since the reductio argument he is using depends crucially on the unlikelihood of species evolution following separate but parallel tracks to arrive at the same species end point. Since all humans are descendants of this single animal Henry, we conclude that all the early humans must be the ancestors of all of us. So when Dawkins talks of us all sharing the same ancestors at some point, he means human ancestors, since all humans evolved from Henry’s line.

Of course, as time progresses, the human species descended fro Henry produced more descendants who then produced yet more descendants and so on, and there must come a time when the lines diverged so that not everyone living at later times is the ancestor of all of us, but only some. That transition time is called the identical ancestors (IA) time. i.e., Earlier than that, every human was the ancestor of all of us or none of us (i.e., their line went extinct). After the IA time, people share only some ancestors.

It is not hard to see that as time progresses even further, there will come a time when we all share just one common human ancestor, referred to as the most recent common ancestor or MRCA. After that time, everyone living today no longer shares a common ancestor.

I don’t know about you, but to me there is something extraordinarily beautiful about this idea that at one point in time we all shared the same single ancestor, and that some time further back, everyone who lived at that time was the ancestor of all of us. It seems to be such a decisive argument against tribalism. It is hard to maintain the idea that some groups of people are ‘special’ in some way, when we not only all descended from a single animal Henry, but that at a later time we all shared the same set of human ancestors. Not only that, but we are also cousins of all the species that currently exist.

No wonder some religious extremists are afraid to have their children learn this theory. It is so captivating one can see how it would fascinate and draw in anybody who begins to think seriously about it.

Having established that we have both an MRCA and a time where all our human ancestors were identical (the IA time), this raises the question of when these dates occurred.

And therein lies another surprise, to be discussed in an upcoming post in this series.

POST SCRIPT: We’re number 1?

Comedian Lewis Black tries to help Americans to see themselves as others see them.

Evolution and atheism

It is commonly charged by some religious people that acceptance of the theory of evolution by natural selection implies acceptance of atheism. Co-discovered by Charles Darwin and Alfred Wallace and brought to widespread public attention with the publication of Darwin’s The Origin of Species in 1859, this theory immediately gained opposition in Europe, primarily from clergy, with the conflict showcased by the famous debate between Bishop Wilberforce and Thomas Huxley in 1860.
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Keeping creationism out of Ohio’s science classes

Recall that the pro-IDC (intelligent design creationism) forces in Kansas received a setback in their Republican primary elections earlier this month. Now there is a chance to repeat that in Ohio.

I wrote earlier about a challenge being mounted to the attempt by Deborah Owens-Fink (one of the most pro-IDC activists in Ohio) to be re-elected to the Ohio Board of Education from Ohio District Seven. It seems as if the pro-science forces have managed to recruit a good candidate to run against her. He is Tom Sawyer, who is a former US congressman. I received the message below from Patricia Princehouse who has been tireless in her attempts at keeping religious ideas out of the science curriculum.

The worst creationist activist on Ohio’s Board of Education is up for re-election (Deborah Owens Fink).

But now she has competition! And with your help, we can win!

We have recruited former congressman Tom Sawyer to run against her. His website is here.

Contributions are urgently needed for Congressman Sawyer’s campaign.

(Credit cards accepted here or send check to address below.)

Fink has pledged to raise lots of money & we have no doubt that creationists across the country will pour tens of thousands of dollars into her campaign. We may not be able to match them, but Sawyer is an experienced politician who can make wise use of what he gets. We need to see he gets as much as possible.

HOW MUCH SHOULD I GIVE?

1) Remember that almost every Ohioan that pays Ohio income tax, can take as a
TAX CREDIT (not just a deduction) up to $50 ($100 married couples filing jointly) in donations to Board of Ed candidates. So, please try to give at least the free $50 that you can get back on your taxes.

2) How much would you give if you could erase the past 4 years of damage to Ohio’s public schools? $100? $1000? $5000? Please seriously consider giving more than you’ve ever given before. You stand poised to prevent worse damage over the next 4 years…

Fink is circulating a fund-raising letter in which she thumbs her nose at science & refers to America’s National Academy of Sciences as a “group of so-called scientists.”

We can protect Ohio from another 4 years of retrograde motion and put someone on the Board who can move Ohio forward toward solving real problems like school funding, literacy, and the achievement gap.

But your help is urgently needed…

www.votetomsawyer.com

I WANT TO DO MORE:

Great! Please spread the word about the web site –in & out of state! (Remember, what happens in Ohio gets exported around the country, so defeating creationism in Ohio benefits the entire country) You can do even more as a volunteer (at home, on the phone, or on the street, even 1 hour of your time can make a difference, especially as we get closer to the election) To volunteer, email Steve Weeks at eul1993@hotmail.com

For info on what Fink has done to science education in Ohio, see here.
For more info on Sawyer, see here.
For more info on other races in Ohio see the HOPE website.
For more info on races nationwide, see here.

To mail donations: Send a check made out to: Vote Tom Sawyer

and mail to:
Martin Spector, Treasurer
4040 Embassy Pkwy, Suite 500, Akron, OH 44333

I was not aware of this provision in Ohio’s tax code that effectively gives you a full refund for up to $50 for contributions to campaigns like this. I have not been able to check this information myself and see what, if any, restrcitions apply and if it applies only to school board elections or other elections as well.

For more information on other School Board elections where the pro-science HOPE (Help Ohio Public Education) organization is supporting candidates, see their website.

It would be nice if Ohio voters take the lead from Kansas voters and also reject IDC-promoting candidates.

POST SCRIPT: Saying what needs to be said

Keith Olbermann on MSNBC’s Countdown delivers a blistering commentary on Donald Rumsfeld and the rest of the Bush Administration. You can see it here.

The language of science

Good scientists write carefully but not defensively. By carefully, I mean that they strive to be clear and to not over-reach, i.e., reach conclusions beyond what is warranted by the evidence. But they are not overly concerned with whether their words will be taken out of context and misused or subject to other forms of manipulation. It is an unwritten rule of scientific discourse that you do not score cheap debating points. Scientists are expected to respect those who oppose them and deal with the substance of their arguments and not indulge in superficial word games.
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Taking steps to avoid global warming

One of the curious features of the debate over what should be done about global warming is what we should be done about it. I can actually understand the position of those who are skeptical about whether things like the Kyoto treaty will solve the problem. I can understand those who worry that government regulations might not work.

What puzzles me are those people who somehow see the actions taken to reduce the production of greenhouse gases as some sort of affront that has to be opposed.
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