California Institute of Technology

From pre-gut cells to glory

For all animals, development begins with the embryo. It is here that uniform cells divide and diversify, and blueprints are laid for future structures, like skeletal and digestive systems. Although biologists ...

Jun 03, 2011 4.5 / 5 (2) 1 | with audio podcast

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 | with audio podcast

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 | with audio podcast