[Richard Feynman] truly believed that if you couldn't explain something simply, you didn't understand it.

We often say that the earth is a sphere, but to be precise, the term sphere refers only to the surface. The correct mathematical term for the solid earth is a ball.

Einstein, in the special theory of relativity, proved that different observers, in different states of motion, see different realities.

Science blogs bore me. When everyone is an expert, no one is an expert.

There is so much to groak; So little to groak from.

I did not come from an academic background. My father was a smart man, but he had a fifth-grade education. He and all his friends were plumbers. They were all born around 1905 in great poverty in New York City and had to go to work when they were 12 or 13 years old.

[Richard Feynman] truly believed that if you couldn't explain something simply, you didn't understand it.