"I deal in tough mathematical questions every day, but please don't ask me to help with Brexit."

"We are all different, but we share the same human spirit. Perhaps it's human nature that we adapt and survive."

"The universe is a mystery, and I'm trying to solve it."

"We are all connected to the cosmos, and it is a wonderful thing."

"The past, like the future, is indefinite and exists only as a spectrum of possibilities."