LATEST ADDITIONS

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."

But the Ace Craft Gen H-4 personal helicopter is pretty darn cool. If you have a Y chromosome, I bet you want one, too.

Having wormed my way up miles of static rope with Gibbs and Petzl Frog ascenders, my biggest desire is to do away with the rope itself. I wants me a set of Gecko gloves and booties!

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.