Acrylic Ball: http://bit.ly/BBBacrylic
Ping-Pong Ball: http://bit.ly/BBBpingpong
This problem has made the rounds on the internet but I felt it deserved a treatment like this.
Special thanks to Gary and the Department of Earth, Planetary and Space Sciences at UCLA, to the students for participating, to Ivy for helping me coordinate everything and to Raquel for filming.
Music by Kevin MacLeod, http://incompetech.com “Monkeys, Spinning Monkeys”