An experiment disproving a prediction is discovery.

Experimental confirmation of a prediction is merely a measurement. An experiment disproving a prediction is a discovery.

Never underestimate the joy people derive from hearing something they already know.

The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

I hope it won't take long.

Before I came here I was confused about this subject. Having listened to your lecture I am still confused. But on a higher level.

Where is everybody? Humans could theoretically colonize the galaxy in a million years or so, and if they could, astronauts from older civilizations could do the same. So why haven't they come to Earth?