Spirals and Plant Growth

I think I've seen an earlier version of these, but I guess this is a revamp for the Khan Academy.

Anyway, Vi Hart is absolutely stunning in this three part lesson :

Great question with interesting first answer.

Kill Math seems a project worth watching.

Update : this is excellent. (Though there might be an issue when you get to higher than two dimensions.)

Over on Quora I'm demonstrating my statistical ignorance. Why is the probability of something about which you have no information not 0.5?

Hoping to learn something ...

I asked on Quora : Are there more Zero-Sum or non Zero-Sum games?

Wired on the Gausian Copula. Some of the article smells a bit naive but I guess the basic story is OK.

I'm reminded of my ThoughtStorms page : Markets As Bonfires of Reason which has been around in one form or another since January 2006.

Must read article on mathematical analysis of traditional musical structure.

Dmitri Tymoczko transforms musical representation int higher-level mathematical spaces to find that the twin constraints of harmony and melody (in traditional structures) are captured within particular bounded regions of these spaces.

Bonus points :

The mathematician Rachel Hall and I are also exploring some interesting resemblances between music theory and economics. Similar geometrical spaces appear in both disciplines, and questions about how to measure distances between musical chords are very similar to questions about how to measure the distance between economic states.

(hat-tip zby)

Update : your annoying Flash site may look cool, Dmitri, but it prevents me linking directly to your great essay on scale-networks in Debussy and giving it all that lovely Google-juice. FAIL!