this point is at five and this point is at six or five plus one because they're separated by one unit maybe it's inches maybe it's centimeters whatever it doesn't matter if we make this space a little smaller the second point might be at five plus a half or five plus NUMBER_TOKEN/NUMBER_TOKEN or five plus a hundredth or five plus a thousandth the points keep getting closer together they're almost the same point but not quite if we keep this up we can get closer and closer and closer until the points are at five and five plus an unimaginably tiny number so tiny it's not even useful to label it as a number anymore we call it an infinitesimal and label it DX welcome to calculus I know my calculus you post me equals us anyway in infinitesimal as an amount of space that is as close to zero as we can get without actually being zero it's as local as our math can get of course DX is just one dimension DX and dy make two dimensions included DZ and you've got three dimensions also known as space included DT and you've got a four dimensional space times the volume DX dy DZ is the local here and the DT is the local now that's all that really exists there's no universal reference frame because there's no universe at least in the way that people usually understand it this space-time diagram is only a mapped of predictions about a non-existent future and predictions about a non-existent past it's attached to you as you move through space-time space-time doesn't deny you free will because the future doesn't exist all that exists for anyone is their local here and their local now you might not have control over much in your life but you always have a choice about what kind of person you are here and now make that choice a good one please share your thoughts in the comments thanks for liking and sharing this video don't forget to subscribe if you'd like to keep up with us and until next time remember it's okay to be a little crazy why is the speed of light that specific number well we know it can't go at infinite speed because that would violate causality it has to be finite but the exact value is kind of an accident as far as we can tell it could just as easily be a different value in a different universe the universe just might not have humans in it anyway thanks for watching that's fast
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