What if our lives were like DVDs? What if we had alternative endings to look forward to, instead of death? We explore our lust for immortality. And we look at the many alternative endings that Ernest Hemingway wrote for his classic novel, "A Farewell to Arms."








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...