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.

There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement. If the result is contrary to the hypothesis, then you've made a discovery.

An experiment disproving a prediction is discovery.

Young man, if I could remember the names of these particles, I would have been a botanist.

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?

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

Ignorance is never better than knowledge