On the Origin of Species by Means of Natural Selection - Charles Darwin
One of if not the most important book ever written - imho.
available for free Kindle download @ Amazon.
Get it FREE for xmas for any 'Creationists' you know.
mods, I put in here so more people would see it.
just noticed lots of other great works (shelleys 'frankenstein', Einsteins 'theory of relativity' etc. etc, all FREE at the bottom of the page