Bad Astronomy (gotta love that name) hosts a video animation of what would happen if a 500-mile wide asteroid hit the Earth. Yes, I could have embedded the YouTube video here, but I found BA's comments worthwhile.
Conventional wisdom holds that continental strength relies upon the solidity of rock at a depth of 15km and that below that pressure and heat cause the rock to flow as liquid. Not so fast, say Klaus Regenauer-Lieb, Roberto F Weinberg, and Gideon Rosenbaum. Their new study says that "through dynamic interaction the strongest part becomes the weakest."
As my buddy Jeff and I were walking around the neighborhood recently, I was struck by how many drop-dead gorgeous high-school age girls there were. Feeling sort of dumb for asking, I said, "Is it my imagination or have girls gotten prettier since we were in high school?"
"When you're carrying a book with the big fat title Embalming." Lisa Takeuchi Cullen has written a gentle update to The American Way of Death. Putting aside her statement that "death is a big, huge bummer," it sounds interesting.
Fixed gear bikes, in case you don't know, have no freewheel, which means that if the rear wheel is turning, you're peddling. There's no coasting on a fixie—and braking is a matter of leg power.