California Institute of Technology

Why do we sleep?

While we can more or less abstain from some basic biological urges—for food, drink, and sex—we can’t do the same for sleep. At some point, no matter how much espresso we drink, we just crash. ...

Feb 03, 2011
3.7 / 5 (72) 8

The way of the Droid is near

Noon: a crowded cafeteria. You drift past the salad bar, glumly eyeing the line at the pizza counter. But what's this rolling toward you? It's a little robot-vaguely reminiscent of the movie 'droid WALL∙E-and ...

Jan 05, 2011
5 / 5 (2) 0

Voyage of the DNA Treader

Richard Feynman was right: there is plenty of room at the bottom, and the beeping, lumbering trashcans of 1950s science fiction are gradually giving way to micro-droids the size of a speck of dust . . . or even a molecule.

Dec 30, 2010
4.2 / 5 (9) 1