well apparently (i vaguely remember this from a documentary from like 4 years ago so some details could be wrong) within about 100 years we apparently will have home computers powerful enough to simulate a copy of earth so perfect the inhabitants of the simulated earth will be unaware that they are simulated so in theory we could be simulated in someone's video game or a class room presentation by people who have already made it to 100 years in the future and who are simulating 100 years in the past