"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…"

"There are no black holes in the sense of a region of spacetime from which nothing can escape. Instead, there are apparent horizons which persist for a time and then vanish."

"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 universe is a big place, and we are a small part of it. But we are an important part of it."

"I think [contacting an alien civilization] would be a disaster. The extraterrestrials would probably be far in advance of us. The history of advanced races meeting more primitive people on this planet…"