Not all bits have equal value.

It is clear that the nations of the world now can only rise and fall together. It is not a question of one nation winning at the expense of another. We must all help one another or all perish together.

Science is more than a body of knowledge. It's a way of thinking: a way of skeptically interrogating the universe.

If you are only skeptical, then no new ideas make it through to you. You become a crotchety old person convinced that nonsense is ruling the world. (There is, of course, much data to support you.) But every now and then, a new idea turns out to be on the mark, valid and wonderful. If you are too much in the habit of being skeptical about everything, you are going to miss or resent it, and either way you will be standing in the way of understanding and progress.

Some 5 billion years from now, there will be a last perfect day on Earth... then the sun will begin to die, life will be extinguished, the oceans will boil and evaporate away.

Human beings grew up in forests; we have a natural affinity for them. How lovely a tree is, straining toward the sky.

The well-meaning contention that all ideas have equal merit seems to me little different from the disastrous contention that no ideas have any merit.