Found a nice web page.

Tyger
Short but interesting descriptions of several subjects, e.g. string theory and general relativity.

http://www.theory.caltech.edu/people/patricia/index.html [Broken]

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Tail
Are you talking about the page that says:
For example, Archimedes' rule tells us that the length of the hypotenuse of a right triangle equals the sum of the squares of two sides. That rule actually defines a space metric called the "flat" metric or the "Euclidean metric" in two space dimensions.

'Interesting' is all I can say.

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