Only realistic flight schedules should be proposed, schedules that have a reasonable chance of being met. If in this way the government would not support them, then so be it. NASA owes it to the citizens from whom it asks support to be frank, honest, and informative.

Everything is made of atoms.

If all of this, all the life of a stream of water, can be nothing but a pile of atoms, how much more is possible?

I wonder why. I wonder why. I wonder why I wonder.

There in wine is found the great generalization: all life is fermentation.

There are theoretical physicists who imagine, deduce, and guess at new laws, but do not experiment; and then there are experimental physicists who experiment, imagine, deduce, and guess.

Mathematics is not just a language. Mathematics is a language plus reasoning.