We do not know whether there are extra dimensions or multiverse. Let's go forward with the possible ideas that come out of the mathematics. It's hard for us to imagine a universe that would have no time at all.

I've seen children's eyes light up when I tell them about black holes and the Big Bang.

I can't stand clutter. I can't stand piles of stuff. And whenever I see it, I basically just throw the stuff away.

...quantum mechanics—the physics of our world—requires that you hold such pedestrian complaints in abeyance.

I would say in one sentence my goal is to at least be part of the journey to find the unified theory that Einstein himself was really the first to look for.

When general relativity was first put forward in 1915, the math was very unfamiliar to most physicists. Now we teach general relativity to advanced high school students.

For me it's been very exciting to contribute to the public's understanding of how rich and wondrous science is.