Things what I learned at lectures yesterday:
- If 10 people are sitting on 10 chars, there are 3,628,800 different ways for them to sit. (1*2*3*4*5*6*7*8*9*10)
- You can predict the movement of a pendulum exactly using mathematics, but if you add a "knee joint" to the pendulum and thus make it a double pendulum, you can't predict it AT ALL for more
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