Where are the people from the future?

[Anomalocaris]

Ask Australians...apparently they are from the future.

A few Australian I've met were apparently from so far in the future that they had reached all the way around the loop of time to become Neanderthals again.

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What?

Arrow shows flow of time forward. If purple is when the machine STOPPED working for some time, but then was turned BACK ON, can someone in the red timezone travel to black, or only within red?

The understand seems to be no. As I understand it, this theory says time machine can theoretically grant access to any point in time within its current period of continuous operation, whether that's in the past or in the future. Once it is turned off, the points in time accessible before it was turned off becomes inaccessible forever. If you turn it on again, you can only freely access any time during the new period when it remained on, not a previous period when it was on.

Don't ask me what happens if you have multiple time machines with partially overlapping periods of operation.

This doesn't really solve paradox of time, but this notion did come out of the mouth of a Nobel prize winning physicist, and it does seem to solve the problem of why there are no visitors from the future.

[naimless]

Time travel is impossible because I wouldn't exist right now if x can change how I existed in the past.

[Exian]

If time travel is invented in the future then the future humans could travel back to when anatomically modern humans first emerged and teach them every they know. Allowing them to extend the time allotted for advancements in all fields of science. We could repeat this process until we reach a point where no advancements could be made. The instant anatomically modern humans emerged would also be the moment we reached our peak. Since we're playing "what if" then lets just say we beat death. We also prevent evolution. No more sex and no more reproduction. We would never have to let the destruction of the universe play out. Order would be made permanent and time wouldn't exist except in little bursts.

This all sounds terrible. Lets just not invent time travel.