What tool would you put in your cognitive toolkit?

The Edge annual question and its answers are out. This year, John Brockman asked, “What scientific concept would improve everybody’s cognitive toolkit?” He got 158 people to send in answers.

I was one of them. If you like my answer, you might also like Sean Carroll’s and Carl Zimmer’s — we seem to have made similar points. Carl has a thread on the topic, and so does Sean: I think I like his original title of dysteleological physicalism better, never mind Carl’s post deploring jargon.