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RE: did human really did this?? build a nuclear reactor 1.8 billion years ago.....
Interesting post @mubashar1122 !
This theory about humans being around for more than 200,000 years has been going around for quite some time, and I'm very fascinated by it.
But let's be realistic for a second here. The chances of it having been humans are slim to none compared to the chance there this was the work of aliens.