One can't predict the weather more than a few days in advance.

Save water. Shower with your girlfriend.

Someone told me that each equation I included in my book would halve the sales. I did put in one equation, Einstein's famous equation, E = MC squared. I hope that this will not scare off half of my potential readers.

People who boast about their I.Q. are losers.

It is impossible to imagine a four-dimensional space. I personally find it hard enough to visualize a three-dimensional space!

Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory.

"Sooner or later disasters such as an asteroid collision or a nuclear war could wipe us all out, But once we spread out into space and establish independent colonies, our future should be safe."