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How Far Away Are We From a Theory of Everything?
In physics, the biggest challenge is to unify quantum mechanics with gravity. Once we have experimental evidence for how this happens in nature, then the theory will fall into our lap. Another important question is what happened at the beginning of the universe? What happened before the Big Bang? And by the way, on that, there are some conjectures. It's possible to imagine that we will figure out how to create a universe in the laboratory. By irritating the vacuum, you might create a baby universe.