Life is like riding a bicycle. If you want to stay balanced you've got to keep moving forward.

Not all things worth counting are countable and not all things that count are worth counting.

Strange is our situation here upon earth.

The wireless telegraph is not difficult to understand. The ordinary telegraph is like a very long cat. You pull the tail in New York, and it meows in Los Angeles. The wireless is the same, only without the cat.

Our world faces a crisis as yet unperceived by those possessing power to make great decisions for good or evil. The unleashed power of the atom has changed everything save our modes of thinking and we thus drift toward unparalleled catastrophe.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

It is just as important to make knowledge live and keep it alive as to solve specific problems.