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

"The universe is a place of endless possibilities, and we are just beginning to explore them."

"The human race is a single genetic stock, and we are all brothers and sisters. It's time that we started to act like it."

"The universe is not just out there, it's in here."

"When I gave a lecture in Japan, I was asked not to mention the possible re-collapse of the universe, because it might affect the stock market. However, I can reassure anyone who is nervous about their…"