Many libertarians know much about economics, law and ethics but are very weak on natural sciences. Michael Shermer is a brilliant intellectual who knows about both natural and social sciences, a great combination of intelligence and freedom.
In Skepticblog he explains how he became and why he is a libertarian.
All his books are very good. The latest one is The mind of the market.
[...] science writer, and author of The Mind of the Market, is both libertarian and skeptic. As one blog commented recently, "Many libertarians know much about economics, law and ethics but are very weak on natural [...]