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I've read Livio's book and found it very interesting. For even more information on Phi and the Fibonacci sequence, I highly recommend checking out this site.
A town has only one male barber. If he shaves every man in the town except for those who shave themselves, does he shave himself?
The problem implies the barber, being male, is shaven.
Another one:
This sentence is false.
True or False?
Stephen Hawking's On The Shoulders of Giants talks about Newton's Principia and includes the text. Hawking also talks about Copernicus, Galileo, Kepler and Einstein, and their respective contributions to Physics. The ISBN is 0762413484.