Enrico Fermi — Italian Physicist born on September 29, 1901, died on November 28, 1954

Enrico Fermi was an Italian physicist, who created the world's first nuclear reactor, the Chicago Pile-1. He has been called the "architect of the nuclear age", and the "architect of the atomic bomb". He was one of the few physicists to excel both theoretically and experimentally. Fermi held several patents related to the use of nuclear power, and was awarded the 1938 Nobel Prize in Physics for his work on induced radioactivity by neutron bombardment and the discovery of transuranic elements. He made significant contributions to the development of quantum theory, nuclear and particle physics, and statistical mechanics... (wikipedia)

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.
Before I came here I was confused about this subject. Having listened to your lecture I am still confused. But on a higher level.
If I could remember the names of all these particles, I'd be a botanist.
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.
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.