More from Chalkdust
How to make: a chaotic scatterer
Make your own scatterer from some old Christmas decorations
How to make: a catastrophe machine
Make a catastrophe machine just like Zeeman's
Why knot?
You can un-knot a knot, by cutting it not?
Geographic profiling
Murder, maths, malaria and mammals
Tennis maths: how long should a deuce point last?
Using Markov chains to calculate some interesting tennis stats!
Can we do good more effectively?
Choosing which charity we donate money to shouldn't be an entirely emotional decision.