"I believe that the universe is governed by the laws of science. The laws may have been decreed by God, but God does not intervene to break the laws."

"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."

"We are all visitors to this planet. We are here for a short time, and we must make the most of it."

"The greatest achievement of the human race is not the invention of the wheel, but the ability to communicate."

"We are all time-travelers, heading into the future at the rate of one second per second."