Gibbo2286 wrote: ↑24 Jul 2017, 15:23Mandrake wrote: ↑24 Jul 2017, 15:19
Heaven forbid that everyone in China runs in the same direction at the same time.
Or jumps up and down.
Jumping up and down would be too random in timing to have any net effect, as some people would be landing as others were jumping up etc. But if everyone in China were to run east or west for 30 seconds at the same time it would definitely affect the rotation of the earth, but it would return to normal after they stopped!