"I think that the universe is a beautiful and complex place, and I'm very lucky to be able to study it."

"The human race is a single, genetic family."

"I think that the human race has a great future ahead of it, if we can just learn to cooperate."

"The universe is a wonderful place, and I'm glad to be alive to see it."

"Although the chance of a disaster to planet Earth in a given year may be quite low, it adds up over time, and becomes a near certainty in the next thousand or 10 thousand years."