Think of a Number
A light-hearted exploration of maths and science, presented by Johnny Ball.
2. What does exactly mean exactly ?
0.0Sep 22, 1982 · 30 min
Johnny finds out how to measure a metre, what keeps a marching soldier in line when he puts his best foot forward and how a laser gets the measure when spying on a locked room. Meanwhile - how many times can you take accurately three from 333 ?