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## Video instructions and help with filling out and completing Who Form 2220 Compute

### Instructions and Help about Who Form 2220 Compute

Theoretical physics, what does that make you think of? Maybe added physics in school or maybe you think of one of the greats like Albert Einstein. Maybe you think of fundamental particles, the elementary building blocks of our universe. I'm a theoretical physicist and I think of these things, but I spend an awful lot of time thinking about knots. What I usually want to know about knots is whether one knot is the same or different from another knot. What I mean by this is, can the knot on the right be twisted and turned around and turned into the knot on the left without cutting, without using scissors? If you can do this, we say they're equivalent knots, and otherwise, we say that they're not equivalent. Surprisingly enough, this question of equivalence of knots is very important for certain types of fundamental particles. Furthermore, it's important for the future of technology. This is what I'm going to tell you in the next 15 minutes. To get started, we need some of the results from relativity. Now, relativity is a pretty complicated subject. I'm not going to explain much of it, but one of the themes that we learn from it is that space and time are mostly the same thing. So, I have a little story to tell to explain this. It's a story of Einstein's world and his day. So, we have his home, his work, his cinema on the screen, and there's a clock in the upper right-hand corner. So, keep your eye on the clock during the day. Einstein starts his day. He goes to work. Then, after a while, he comes home for lunch. The clock keeps ticking. He goes back to work. The clock keeps ticking. In the afternoon, he decides to go to the...