I play a lot of card games, mostly bridge. People shuffle cards in many ways and this video shows how well cards get mixed when you do so. It turns out that whichever method you choose, shuffling it seven times pretty much mixes the cards equally well.
(Via Cory Doctorow.)
One of the most common arguments that are presented for the existence of the afterlife are the reported near-death experiences, where people say that they died, entered the afterlife, and then for some reason returned to life again and were able to report what they saw. I can’t count the number of times religious people have told me that such experiences are real and prove that their god and heaven exist.
There seems to be an inexhaustible desire for such stories and are eagerly lapped up by religious believers, even though no real evidence has been produced to substantiate them. This article by Arthur E. Farnsley II describes the case of one person who said he actually died (not merely that he was near death) and returned from the dead, not once but twice. Of course he wrote a book about his experience. The article explores how rationalists might respond to such claims.
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This Pearls Before Swine cartoon struck home for me because, like Rat, I have an iPhone 5. I am not one that needs to have the latest version of anything. If the old one works, I stick with it. In fact, I have never bought a cell phone in my life. The ones I have used have all been hand-me-downs from my spouse or children when they upgrade to new phones.
I am perfectly happy with my old iPhone 5 and would be quite content to continue to use it forever because it seems to be working fine as far as its basic functions of calls and texts and its data storage features. But I am feeling pressure to upgrade. The problem is not the phone itself but that one by one, various apps are upgrading to versions that are no longer supported by the phone. The iOS operating system I have is 10.3.4 which is the latest one that my hardware can support but the updates of various apps require newer versions of iOS and that would require me to get a newer phone just to use those apps.
I am holding out for now even though some things (like depositing checks in my bank account) can no longer be done by phone and I have to do it the old-fashioned way.
Sigh.
On the computer keyboard, apart from the space bar and shift keys which are both used considerably, the next biggest key is the Caps Lock key which is almost never used, except by those who like to use all capitals all the time. These are probably the same people who immediately get onto the fast lane on the highway and stay there, irrespective of the level of traffic.
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This video takes a look at Newton’s law of gravity that is written in the form F=GMm/r2 and points out that although the law is referred to as a ‘universal’ law of gravity, it does not hold for very strong gravitational forces involving very large masses (where the General Theory of Relativity needs to be used). He also points out that the law has not been tested very precisely in cases where the force is very weak, such as with small masses, but that we assume it holds true in that regime.
Anyone who hangs round children will have heard of Raffi, the singer of songs that have a great appeal for the little ones. My personal favorite is Baby Beluga.
Inspired by the activism of young people around the world like Greta Thunberg, he has come out with a new song about climate change called Young People Marching.
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Neodymium magnets are extremely strong, as anyone who has ever handled them knows. This video shows how strong the forces generated by them are. One should be very careful though, because you can hurt yourself and any nearby electronic equipment with these magnets.
One of the practical uses of these magnets is to have cows swallow them. Yes, really. This is because cows often swallow bits of metal (nails bits of wore, staples, etc.) that are in the pastures where they feed and this can harm them. These powerful ‘cow magnets’ settle in a part of the digestive system called the rumen, where they collect the metal pieces that pass by and prevent them from going further into the system and causing harm.
Physics has long been considered the canonical science. It is not the oldest mathematical science, since astronomy predates it by centuries but that discipline lacked an experimental basis. Physics deals with the inanimate world and so is free of the messiness and ethical constraints that complicate other disciplines that deal with living things. It has an empirical basis of observations and experiments and yet has a high level of abstraction that enables simplified models to approximate reality. And the mathematical framework in which its theories are expressed gives its predictions a level of precision and rigor.
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I have long been interested in the question of free will and back in 2010 even wrote a 16-part series (!) looking into what was known about it. Many people are Cartesian dualists where they view the brain and mind as distinct, the former being a physical organ while the latter is an immaterial entity, dubbed the ‘Ghost in the Machine’ by Gilbert Ryle, that controls the cognitive processes of the former, though how that actually happens has not been made clear.
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There is a new twist to the long-running saga about the mysterious ailment that struck personnel working at the American and Canadian embassies in Havana, Cuba. Initially the US accused Cuba of using some kind of sonic weapon to attack their diplomats. But this seemed highly implausible, not least because there did not seem to be any evidence that such a weapon existed and it was not clear why the Cuban government, even if it had such a weapon, would do such a thing at a time when they were trying to improve relations with the US.
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