This video explains how Bitcoin works in 3 minutes.
Directed, Designed and Animated by Duncan Elms - www.duncanelms.com www.anotherplace.tv
Written and Voiced by Marc Fennell - www.marcfennell.com
A talk on some problems solved related to CSS Performance at GitHub. The talk was given at CSS Dev Conference in Honolulu, HI 2012. The slides are available in PDF form here https://speakerdeck.com/jonrohan/githubs-css-performance