[bryanh]

An excellent video on the phenomenon from the "Engineer Guy" series: http://www.youtube.com/watch?v=F5Ri_HhziI0

And just in case you feel like killing about 20 minutes of your day, check out the rest of his videos. They are excellent.

[missing_cipher]

I love his videos. I wish he would make more. The harddrive one was interesting.