Scientists tell us optimistic people are happier, healthier and even live longer than pessimists. But it's hard to maintain an optimistic frame of mind in the face of daily reports of war, famine, disease and injustice. In this hour of To the Best of Our Knowledge, evidence that the world is...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...