Michio Kaku

I do not think we live in a computer simulation. No digital computer can compute all the motions of molecules in a simple object, e.g. the weather. The smallest object which can simulate the weather is the weather itself. When you add quantum corrections, then no digital computer on earth can simulate the quantum effects in the weather. So no digital computer can possibly simulate reality as we know it.

No one knows. But one possibility is that the universe is a bubble of some sort. We live on the skin of the bubble. If you travel in one direction far enough, you come back to where you started. So the farthest object is the back of your head. In this way, this bubble universe is infinite in two dimensions, since you never hit the end, but finite in three dimensions, since its just a bubble.

Thank you. We are all born scientists. We are born wondering where we came from, why the sun shines, why the stars twinkle, etc. But eventually we hit one of the greatest destroyers of science known to science, high school. In high school, science is made boring and irrelevant to people's lives. In my books, I try to make young people cherish science once again.