In the second half of Mutants, it talks about everything from genetics, to the question of life and death. The most amazing section to me was the section on theories of how people age. There are tons of theories, but the one most people believe in is the free radical theory. The free radical theory is the theory that molecules that are capable of oxidising DNA, proteins, lipids, just about anything they come in contact with, are the reason for aging. The theory states that these molecules that cause all this oxidization are the reason people get wrinkly, organs fail, and that everything ages. Free radicals for sure damage cells and “There is an abundance of correlative evidence that supports this”. Everyone and everything has these free radical molecules. Most don’t do any damage, but if a free radical hits a gene that is vital to the survival of a cell, it could kill the cell. If a free radical hits a gene in a stem cell, it could initiate cancer. If the free radical hits a sperm or egg cell, it could be transferred to the next generation of offspring. The rest of the book talks about examples of aging from how currently we live a lot longer than in the 1960’s, and how in the 1960’s we lived longer than in the 1800’s and so forth. The book is really an interesting read for people who are planning on doing something biological in the future and it has really good information in it.