It used to be simple to pick out a shade of paint, before computers made almost infinite gradations possible. Now if you stare at those samples long enough they all start to look alike. It turns out color is as much a mental construct as a physical substance. In this hour of To the Best of...Read more


Scientists are launching one of the most audacious projects ever conceived: a detailed map of the human brain, neuron by neron, synapse by synapse. For some scientists...
