Time
Without time, we would be lost. Time is a concept based souly on assumption. We assume the future will come, no matter how long it takes. We assume we’ll be alive in the next 5 minutes most of the time.
We use time to synchronize our lives and what happens in them. We need time to function as a whole, we base almost everything we know on time. Most of us live in either the past or the future, time already passed, or time yet to come. We hardly ever observe the present, only thinking of what to do next, or what you should’ve done before.
We would get nowhere without time, it’s the soul concept of human knowledge. But time isn’t real, it’s only a human concept. It’s how we measure untangible distances. This is why i don’t think a time machine can be created. Sure, there’s probly wormholes that bend the known demensions, but time travel as we see it in science fiction is impossible because time is completely made-up. We can’t make something real based on a man-made concept.