Margaret Wertheim on the beautiful math of coral | Video on TED.com
http://www.ted.com/index.php/talks/margaret_wertheim_crochets_the_coral_reef.html

mathematics environment video

links to other videos

Parallelism and Hyperbolic geometry in models that are crotcehed

kindergarten for adults...play tanks (rather than think tanks)

tan dung ao thun cu lam tham chui chan

médaillon yoyo square