We ask a question we thought was a no-brainer in this podcast: why do we blink?

Film editor Walter Murch tells us about a strange discovery he made years ago while working on The Conversation - could something as small as a blink actually be the trick of his trade? We also talk to Japanese researchers Tamami Nakano and Shigeru Kitazawa about the experiment they conducted to understand how we see the world, when we choose not to, and why.