1. "I never make predictions. I never have, and I never will."

2. "You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."

3. "If I have seen further, it is by standing on the shoulders of giants."

4. "He was my North, my South, my East and West, My working week and my Sunday rest."

5. As we know, there are known knowns. There are things we know we know. We also know there are known unknowns. That is to say we know there are some things we do not know. But there are also unknown unknowns, the ones we don't know we don't know.