It's a Crookes radiometer
Shiny shiny, spinny spinny
(
BrassMonkey PRUNES ARE PLUMS! WAKE UP SHEEPLE!,
Fri 23 Nov 2007, 11:23,
archived)
THANKYOU.
GREATNESS WILL BECOME OF THIS.
(
gronkpan https://twitter.com/VomitingLarry,
Fri 23 Nov 2007, 11:26,
archived)