Freakonomics by Steven D. LevittSuperFreakonomics by Steven D. Levitt
Best Science Books - Non-Fiction Only
1,929 books — 3,625 voters
Sympathy for the Devil by Jerrilyn FarmerOne for the Money by Janet EvanovichA Is for Alibi by Sue Grafton1st to Die by James  Patterson
Fearless Females
778 books — 930 voters

Confessions of an Eco-Sinner by Fred PearceFreakonomics by Steven D. LevittA Short History of Nearly Everything by Bill BrysonThe Omnivore's Dilemma by Michael PollanFast Food Nation by Eric Schlosser
Best Non-Fiction (no biographies)
6,277 books — 8,084 voters