The issue focused on the early days of what is now an almost year-old study, but one that has been working its way through science since it was first published in Science in July 2014. The research found a role for certain neuropeptides in humans' evolution.

(Read more: Nature News)Roughly two years ago, while I was still at Twitter, I got an email from another technology company. It was a letter with a single line. "We have this idea that