Think of a Number
A light-hearted exploration of maths and science, presented by Johnny Ball.
2. The Science of See-through Sand
0.0Sep 17, 1980 · 30 min
He cooks, looks, hits, breaks and bends... glass. See some glass over 3,000 years old, a teardrop that goes with a bang and a singer who has a smashing time. Meanwhile, see if you can see through this one. Divide a clock face with two straight lines so that the numbers in each part are equal.