This quiz is as scientific as I could make it. Which is to say, I put on the lab coat I used to wear when I was a teacher at a Science Centre many years ago.
It’s also based on what I’ve learned from interviewing the more than 70 experts who appear in our videos and documentaries, and then I ran it by two well-known specialists who suggested a few changes. Then my wife fixed all the typos. So here we go!