Stephen Hawking — "The greatest achievement of the human race would be to understand the universe."

"The human race is a single, genetic family. When a child is born, it is born into the human race, not into some particular tribe or nation. The human race is one. And we are all brothers and sisters."

"The world would be a much better place if everyone had a clear, rational view of the universe."

"The human failing I would most like to correct is aggression. It may have had survival advantage in caveman days, to get more food, territory or partner with whom to reproduce, but now it threatens to…"

"We are close to the tipping point, where global warming becomes irreversible. Trump's action could push the Earth over the brink, to become like Venus, with a temperature of 250 degrees [Celsius], and…"

"Some people say I have a chip on my shoulder but it is actually my chin."