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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.

I am not enough of a mathematician to be able to judge either the well-foundedness or the limits of relativity in physics.

Cats are intended to teach us that not everything in nature has a function.

The math of quantum mechanics and the math of general relativity, when they confront one another, they are ferocious antagonists and the equations don't work.

It's embarrassing that we're in the 21st century and we don't even know what makes gravity work. I'm getting older and thinking maybe I should tackle more than the mundane. I may fail, but at least I will have tried.

At the end of the day, teachers aren't going to mess about trying to make me into an Einstein, 'cause it was never gonna happen. We can't all be brainy, can we? That's just the way the world is.

General relativity is the cornerstone of cosmology and astrophysics. It has also provided the conceptual basis for string theory and other attempts to unify all the forces of nature in terms of geometrical structures.

If you hold a cat by the tail you learn things you cannot learn any other way.

As commentators like the American psychologist Gary Marcus have noted, it's extremely difficult to teach a computer to recognise cats. And that's not for want of trying.

Yeah, I am a guy working on physics outside of academia. But I'm nowhere near Einstein's caliber.