Each of these books caused a major change in the way that I think about a particular subject.
Austad SN. Why We Age. Both the physiological why and the evolutionary why.
Brand, S. Whole Earth Discipline: An Ecopragmatist Manifesto. Only science and engineering can solve environmental problems.
Carey (2014). How we learn. Practical advice on how, when and where to study, based on current learning science.
Csikszentmihalyi M. Finding Flow. Happiness comes from doing difficult things.
Dawkins R. The Selfish Gene. Evolution is stranger than you thought.
Diamond J. Guns, Germs, and Steel. Why didn't Native Americans invade Europe?
Kelly, K. What Technology Wants. Biology and technology are inseparable.
Oakley (2014). A mind for numbers: How to excel at math and science (even if you flunked algebra). An excellent book on the neurobiology of learning, with practical advice.
Simpson, GG. Quantitative Zoology. A classic, readable introduction to the biological applications of statistical methods.
Tufte E. The Cognitive Style of PowerPoint. PowerPoint weakens reasoning. Never read aloud from slides.
Vogel S. Life in Moving Fluids. The interface between physics and biology.
Weiner J. The Beak of the Finch. A lifetime of field work on the evolution of Galapagos finches.
Weiner J. Time, Love, Memory. How to be an experimental biologist, and why fruit fly behavior matters.
Wilson EO. The Social Conquest of Earth. Ants and humans rule because of their social structures. Group selection can work (maybe).