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

"I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth."

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

"What makes human beings unique? Some say it's language or tools. Others say it's logical reasoning. They obviously haven't met many humans."

"We are very, very small, but we are profoundly significant."