"I’m convinced that about half of what separates the successful entrepreneurs from the non-successful ones is pure perseverance."

"I'm not saying I'm a god. I'm just saying I have a really good telescope."

"The universe is expanding. We are all expanding. Everything is expanding. What are you doing?"

"If you are scientifically literate, the world looks very different to you, and that understanding empowers you."

"If you want to make an apple pie from scratch, you must first invent the universe."