A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.

This oak tree and me, we're made of the same stuff.

In science it often happens that scientists say, "You know that's a really good argument; my position is mistaken..."

All colours are arbitrary.

Extinction is the rule. Survival is the exception.

Science cuts two ways, of course; its products can be used for both good and evil. But there's no turning back from science. The early warnings about technological dangers also come from science.

There is a report that says that kids who watch violent TV programs tend to be more violent when they grow up. But did the TV cause the violence, or do violent children preferentially enjoy watching violent programs?