Reader's guide for young people: "Dry ice" is frozen carbon dioxide. It is very, very cold: −109.3 °F. It's dry because it sublimates directly from solid to gas, producing no liquid. It was once commonly used for portable refrigeration, but I haven't seen any in a long time. Dry ice is somewhat dangerous to handle; it… » 1/25/15 3:35pm Yesterday 3:35pm

This. Is. Ridiculous. Superman is not a human being; he's an alien with powers and abilities far beyond those of mortal men. He can fly through the sun and reverse time. He could just zap Batman from orbit with his heat vision before Batty could even blink. And don't get me started about Kryptonite; it's a lame plot… » 1/24/15 6:25pm Saturday 6:25pm

Fun facts: New Zealand physicist Ernest Rutherford (1871-1937) is credited with discovering the nucleus and the true structure of the atom. When J.J. Thompson discovered that electrons are much lighter than a hydrogen atom, everyone's first guess was that atoms were made up of electrons. Rutherford attempted to verify… » 1/24/15 11:52am Saturday 11:52am

The HAB Theory by Allan Eckert (1976) posits a shift not of the magentic poles, but of the actual geographic poles. Asymmetrical ice accumulation in the Arctic and Antarctic induce a wobble in earth's rotation that eventually causes it to physically flip, finding a new stable axis of rotation; Antarctica ends up in… » 1/23/15 8:31pm Friday 8:31pm

Sad. SkyMall never had anything whatever to do with shopping; it is an existential reaffirmation of life. There you are, in an aluminum tube filled with a hundred thousand pounds of explosive rocket fuel, on fire and blasting through vacuum over a trackless ocean at nearly the speed of sound, and you're reading about… » 1/23/15 2:03pm Friday 2:03pm

Given the new importance of accurate time there were numerous proposals to synchronize remote clocks by telegraph. Some say that patent clerk Alfred Einstein was inspired by these ideas to think about simultaneity, and information moving at the speed of light, leading eventually to his Special Theory of Relativity. » 1/22/15 11:23am Thursday 11:23am