JAMES GRIME: OK, so 42 is maybe not such a special number in mathematics, but a very special number in nerd culture. PHIL MORIARTY: Good. Good, good, good. Did you want to do something with 42? JAMES...
PHIL MORIARTY: We're talking about something called tau, which is equal to 2 pi. So there's been a huge amount of debate and discussion about this right across the internet....