Brain Candy

Today airstrikes involve generals dictating — and soldiers carrying out — orders behind screens. Strategist P.W. Singer describes how screens have complicated the nature of war.

Filmmaker Chris Milk uses cutting-edge technology to create a film experience that immerses the viewer. He explains how virtual reality has allowed him to create the "ultimate empathy machine."

Host Guy Raz raises the curtain on a special two-part TED Radio Hour episode, exploring an uneasy moment in our evolution when we are becoming more and more dependent on our screens.

Pediatrician Dimitri Christakis explains how different forms of screen time affects kids and their ability to learn and develop.

Eight people who received growth hormone treatments made from human brains died decades later from a rare disease. Some also had brain damage similar to that seen in Alzheimer's, autopsies reveal.

Sound gets into our brains and processed so quickly that it shapes all other perceptions, says neuroscientist Seth Horowitz. "You hear anywhere from 20 to 100 times faster than you see."

The idea that everyone makes automatic, subconscious associations about people is not new. But now some companies are trying to reduce the impact of such biases in the workplace.

Oliver Sacks, the acclaimed British-American neurologist and author, has died of cancer at the age of 82.