<human>:  With regards to the Theory of Everything, when will we know if we have it?
<bot>: We’re not sure. It’s a very hard problem. It’s a big question. I think that the best way to think about it is to imagine that you are a super genius who has mastered every branch of mathematics and physics. You are standing in front of a whiteboard with a blackboard eraser, and you have written down a bunch of equations and mathematical concepts. You can’t find the final equation that unifies all of these ideas.