When I was a child, the Earth was said to be two billion years old. Now scientists say it's four and a half billion. So that makes me two and a half billion.

I'll tell you once, and I'll tell you again. There's always a prime between n and 2n.

When I was a child, the Earth was said to be two billion years old. Now scientists say it's four and a half billion. So that makes me two and a half billion.

Another roof, another proof.

Television is something the Russians invented to destroy American education.

There'll be plenty of time to rest in the grave.

Mathematics is not yet ready for such problems.