This one is on biology - natural selection, neo Darwinism. An interesting book & written extremely well. The author has really explained the concepts & his views very well, using various analogies & examples. So best part is I could understand everything that was written :D. Second best part is I enjoyed reading it :)
The main point in the whole book is that - natural selection is the theory of evolution. Through natural selection we have been explaining evolution till now. And genetic unit is the unit of natural selection & not individual. The natural selection takes place at the level of the genes [basic unit] & so our genes are selfish. They are selfish because the only thing that matters to them is their survival & so they will do anything, just anything for their survival. Now that is being selfish at the core level, even if that seems altruistic at the individualistic level.