"No history of the world can be complete which does not mention Mary Helen Keller... whose overcoming of her blindness and deafness were arguably victories more important than those of Alexander the Great, because they have implications still for every living person."

"General principles are not the less true or important because, from their nature they elude immediate observation; they are like the air, which is not the less necessary because we neither see nor fee…"

"Reptiles and amphibians are sometimes seen as simple, primitive creatures. That's a long way from the truth. The fact that they are solar-powered means that their bodies require only 10% of the energy…"

"I would love, in all honesty, to do another album with the Mamas and Papas sometime. I miss them. We're still friends and we want to be friends. Because you break up a successful group, which is reall…"

"A boy of ten or eleven has a few great sexual experiences—he thinks they’re great—but then he has the bad luck to get caught and get in trouble. They try to persuade him by punishment and other explan…"