"Because there is a law such as gravity, the universe can and will create itself from nothing. Spontaneous creation is the reason there is something rather than nothing, why the universe exists, why we…"

"The only advantage of my disability is that I do not get put on a lot of boring committees."

"I tell my kids: Don't spend all your time at the computer. But then I realize, I do that myself all day."

"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…"

"The greatest achievement of mankind is to understand the universe."