We’ve known for a while that having certain facial features will lead people to judge you as either trustworthy or untrustworthy. And in fact our brains make those complex judgments much faster than we could have ever imagined. Now scientists have worked out how we do it.
This post isn’t for the squeamish. Whether we are talking about Hannibal Lecter, Sweeney Todd, the witch in Hansel and Gretel, or the many accounts from early human history, cannibalism makes us uncomfortable. And why wouldn’t it? Who wants to think about people eating other people or worse, being on the menu yourself?
What is the longest a person can hold their breath for, and survive without obvious brain damage? No Googling… Five, ten, maybe even 15 minutes? Take a deep breath… how about 22 minutes!? That's the Guinness World Record. Given what we know about the enormous risks of permanent damage if the brain is starved of oxygen for even short periods, how on earth can that be possible?