Columbia University urban designer Mitchell Joachim talks about designing an environmentally friendly city from scratch. "Location is everything," he says.
NASA astronomer Drake Deming talks about using brightness detectors similar to those on digital cameras to help in the hunt for Earth-like planets around other stars.
Stone tools and 2 front teeth, found decades ago, were recently dated by paleoanthropologists. It's evidence that the first humans arrived in China 1.7 million years ago.
Nanoscientist Ray Baughman is steering humanoid robots towards a power system that mimics our own human muscles and doesn't need to be plugged in to recharge.
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