The Paper Centrifuge, from Pitt T. Maner III
This is rather amazing:
"Ultra-low-cost, hand-powered centrifuge is inspired by whirligig toy"
"A high-speed camera showed that the human-powered centrifuge could reach rotational speeds of 125,000 rpm, generating centrifugal forces of 30,000 g. This is faster than many commercial centrifuges, yet the device costs just a fraction of a dollar to make."