Paradoxes
Links
The World of Paradox
http://sps.nus.edu.sg/~ngbeesan/main.html
Site containing some well-known paradoxes, together with a discussion of each.
Zeno's Coffeehouse
http://www.valdosta.edu/~rbarnett/phi/zeno.html
Site maintained by Ron Barnette, which regularly proposes paradoxes in common sense reasoning and invites and publishes responses to them.
Zeno's Paradox of the Tortoise
http://www.mathacademy.com/pr/prime/articles/zeno_tort/
An article in the Platonic Realms.