Why Evolution Is True : I took this out from the library once, read about a quarter of it. I have now purchased it and looking forward to really absorbing it. I understand why evolution is true but Coyne also explains (very well i must say) some of the evolutionary paths and events that have happened on earth. I also enjoy his debunking of Intelligent Design.
Elementary Particles: Series of lectures given by the great Enrico Fermi, who was one of the 20th century pioneers in quantum mechanics and fundamental physics.