That's an interesting realization isn't it? Space and time should be treated the same. Except for minus sign. Except for the minus sign. Makes all the difference. Tell me about the minus sign. Well there is this one place in Einstein's equations where there is a minus sign. That's the only way in which time and space enter differently and nonetheless the result of that is of course that they feel completely different from one another. Space feels like something you can go at will wherever I want in, where time feels as we know like one way straight. I think we could freely move through time without a minus sign. If there were no minus sign. Life as we know it would be completely different and we would probably not. It's a great sense and sense. Feel that things were happening. In fact you can prove mathematically that there would be no point in having a brain even because you wouldn't be able to predict things in the way we do. It's one of the great sentences. That is one of the great sentences I think that I'd ever heard. What? You can prove mathematically that there would be no point in having a brain. We have brains because by measuring and observing what's in one part of space time we can calculate what's in another part of space time in our future and that's useful. So that's looking at what's now, looking at the now. We can predict the next now. Exactly. Whereas if it weren't for that minus sign we couldn't do that. It would be kind of like saying I know what's happening over here. Let me try to predict what's happening over at Harvard. It doesn't work and they all have to do that minus sign.