Patriotism is the willingness to kill and be killed for trivial reasons.

What Galileo and Newton were to the seventeenth century, Darwin was to the nineteenth.

Aristotle could have avoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth open while he counted.

Worry is a form of fear.

One of the most painful circumstances of recent advances in science is that each one makes us know less than we thought we did

Science seems to be at war with itself.... Naive realism leads to physics, and physics, if true, shows naive realism to be false. Therefore naive realism, if true, is false; therefore it is false.

No people anywhere in the world would accept being expelled en masse from their own country; how can anyone require the people of Palestine to accept a punishment which nobody else would tolerate?