As usual, nature's imagination far surpasses our own, as we have seen from the other theories which are subtle and deep.

Scientific knowledge is a body of statements of varying degrees of certainty -- some most unsure, some nearly sure, none absolutely certain.

But there is nothing in biology yet found that indicates the inevitability of death.

I have argued flying saucers with lots of people. I was interested in possible. They do not appreciate that the problem is not to demonstrate whether it's possible or not but whether it's going on or not.

It is the fact that the electrons cannot all get on top of each other that makes tables and everything else solid.

What Do You Care What Other People Think?

Philosophers say a great deal about what is absolutely necessary for science, and it is always, so far as one can see, rather naive, and probably wrong.