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

Once upon a time there was a brilliant scientist named Enrico Fermi. He was so smart, he could solve any scientific problem with a snap of his fingers! He was also known for his witty quips and his ability to turn any scientific conversation into a joke. He was a master at making physics fun. One day Enrico was walking down the street when he saw a sign that read "Atomic Energy For Sale." He stopped in his tracks and said to himself, "I'm no salesman, but I guess I could split the atom and see what happens!" And so he did, and the rest is history! Thanks to Enrico Fermi, we now have nuclear power and all the amazing advances that come with it. So the next time you find yourself in a physics class, remember Enrico Fermi and his wit - and don't forget to have a little fun!