Stanford Encyclopedia of Philosophy
Links
William Penbygull
http://plato.stanford.edu/entries/penbygull/
Life and work of 15th Century Oxford Realist philosopher; by Alessandro Conti.
William Whewell
http://plato.stanford.edu/entries/whewell/
Life and work of 19th century British philosopher; by Laura J. Snyder.
Zeno's Paradoxes
http://plato.stanford.edu/entries/paradox-zeno/
Discusses the paradoxes of Zeno of Elea, e.g., Achilles and the Tortoise; by Nick Huggett.