That most excellent blog on plant genetics and scientific agriculture, Biofortified, is having a fundraiser to maintain their educational and reporting efforts (there’s a full breakdown of where the money goes on the site). They’re not asking much and they produce so much more — help ’em out if you can.
(Also on Sb)
Review the unpleasant nature of the cat’s penis. Now contemplate this: “12 feet long and highly mobile” and “gigantic testes that weigh a ton”.
Although, I do confess, when a pod of these big boys go into rut in your back yard, you’ll probably get even less sleep than when the neighborhood cats are in heat.
(Also on Sb)
Weep for the poor creatures.
But note the steely glint of vengeance in the eye of their living compatriots.
(Also on Sb)
Geoffrey Pearce sent me this argument he uses with creationists, and I thought others might find it useful, too.
I am regularly approached by young Earth creationists (yes, even in the bedlam of sin that is Montreal…) both on the street and at home. If I have the time I try to engage them on the age of Earth, since Earth is something whose existence them and I agree upon. They will tell me that Earth is somewhere between 6,000 – 10,000 years old, and, when prompted, that the rest of the universe is the same age as well. I have taken the approach of responding to this assertion by pulling out a print of the far side of the Moon (attached, from apod.nasa.gov).
I cannot tell you how handy this is! Once they’ve had a good look I usually point out that almost all of the craters were formed by asteroids smashing into the planet, and that the Moon has over 250 craters with a diameter of 100 km or more. After explaining that Earth is just as likely to be struck by large asteroids as the Moon (is more likely to be struck, in-fact, due to its greater gravitational well), I then ask them to consider what their time-scale entails: that Earth should be struck every couple of decades by an asteroid capable of completely ejecting an area about the size of New Hampshire (not to pick on New Hampshire). Since such an event has never been observed and there are no well-preserved impact structures anywhere close to this size range, I then suggest to them that the only sensible conclusion is that Earth is much older than they had thought.
This may seem a convoluted way of making a point about Earth’s age, in particular since more precise and direct dating methods than crater counting are used for Earth, but I think that it may have an important advantage. In the past I have tried explaining to creationists how our understanding of Earth’s age is obtained, but they seem to take the “what I can’t see isn’t real” attitude when they hear words such as “radioactivity”, and “isotope”. Conversely, many of them seemed to be somewhat shaken after seeing this image and hearing my explanation, with one even admitting that the Moon looks “very old”. Furthermore, such images are a good starting point for discussing the degree to which chaos and uncertainty are inherent to the universe. Yay!
(Also on FtB)
Geoffrey Pearce sent me this argument he uses with creationists, and I thought others might find it useful, too.
I am regularly approached by young Earth creationists (yes, even in the bedlam of sin that is Montreal…) both on the street and at home. If I have the time I try to engage them on the age of Earth, since Earth is something whose existence them and I agree upon. They will tell me that Earth is somewhere between 6,000 – 10,000 years old, and, when prompted, that the rest of the universe is the same age as well. I have taken the approach of responding to this assertion by pulling out a print of the far side of the Moon (attached, from apod.nasa.gov).
I cannot tell you how handy this is! Once they’ve had a good look I usually point out that almost all of the craters were formed by asteroids smashing into the planet, and that the Moon has over 250 craters with a diameter of 100 km or more. After explaining that Earth is just as likely to be struck by large asteroids as the Moon (is more likely to be struck, in-fact, due to its greater gravitational well), I then ask them to consider what their time-scale entails: that Earth should be struck every couple of decades by an asteroid capable of completely ejecting an area about the size of New Hampshire (not to pick on New Hampshire). Since such an event has never been observed and there are no well-preserved impact structures anywhere close to this size range, I then suggest to them that the only sensible conclusion is that Earth is much older than they had thought.
This may seem a convoluted way of making a point about Earth’s age, in particular since more precise and direct dating methods than crater counting are used for Earth, but I think that it may have an important advantage. In the past I have tried explaining to creationists how our understanding of Earth’s age is obtained, but they seem to take the “what I can’t see isn’t real” attitude when they hear words such as “radioactivity”, and “isotope”. Conversely, many of them seemed to be somewhat shaken after seeing this image and hearing my explanation, with one even admitting that the Moon looks “very old”. Furthermore, such images are a good starting point for discussing the degree to which chaos and uncertainty are inherent to the universe. Yay!
(Also on Sb)
I’ve written about the spectacular phospatized embryos of the Doushantuo formation before. It’s a collection of exceptionally well preserved small multicellular organisms, so well preserved that we can even look at cellular organelles. And they’re pre-Cambrian, as much as 630 million years old.
They’ve been interpreted as fossilized embryos for which we have no known adult forms. They certainly look like embryos, but one thing has always bothered me — they all look like blastula-stage embryos at various points in their early divisions, and the absence of later stages was peculiar: how did gastrulae and neurulae and other stages avoid getting preserved?
One explanation was that we weren’t seeing metazoan fossils at all — they were colonies of large bacteria. That’s disappointing if you have an animal bias, but still cool — as I pointed out then, it just highlights the fact that the transition from single-celled to multi-celled life isn’t that remarkable.
Now we have another alternative explanation that seems even better to me: they aren’t animals, and they aren’t bacteria, they’re protists. Some of the Doushantuo specimens are rather peanut-shaped, and others are vermiform, odd for an animal embryo, but entirely compatible with the idea that these are encysted stages of propagating protists.
Here are some of these oddly shaped Doushantuo specimens.
Their proposed explanation convinces me. These were protists that were single-celled in their free-living stage which would periodically grow hypertrophically and encyst, forming a capsule containing the dividing cells. These cells would replicate at differnt rates, forming zones of maturation; eventually, the cyst would rupture, released a cloud of propagules, or spores, and the life cycle would begin again.
That would explain a lot about the distribution of forms in these phosphatized specimens — we don’t find any gastrulating embryos because there never were any. These weren’t animals, period!
They belong outside crown-group Metazoa, within total-group Holozoa (the sister clade to Fungi that includes Metazoa, Choanoflagellata, and Mesomycetozoea) or perhaps on even more distant branches in the eukaryote tree. They represent an evolutionary grade in which palintomic cleavage served the function of producing propagules for dispersion.
That’s still very interesting, and again, it reminds us that the transition to multicellularity had many antecedents and could have been reached by many different paths.
Huldtgren T, Cunningham JA, Yin C, Stampanoni M, Marone F, Donoghue PC, Bengtson S (2011) Fossilized nuclei and germination structures identify Ediacaran “animal embryos” as encysting protists. Science 334(6063):1696-9.
(Also on Sb)
Earlier, when I made that point about the limitations of what we can see, touch, hear, and smell, I sure wish I’d seen this cartoon, because I would have used it.
Baby lobsters are far more adorable than kittens!
I am currently staying at my daughter’s house, where our former cat Midnight now lives. There may be some epic battles today, which he will win by peeing on me.
