No matter how hard you try to teach your cat general relativity, you're going to fail.

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.

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.

Relativity challenges your basic intuitions that you've built up from everyday experience. It says your experience of time is not what you think it is, that time is malleable. Your experience of space is not what you think it is; it can stretch and shrink.

The real reason why general relativity is widely accepted is because it made predictions that were borne out by experimental observations.

It doesn't matter if you try and try and try again, and fail. It does matter if you try and fail, and fail to try again.