Where did we come from?
How did humans come about?
Are we the experiment of aliens? The universe is pretty much endless, so we can't be the only intelligent life form out there. If you think about it the earth is 4.5 billion years old yet humans have only been around 200 thousand (6000 years for the modern human). Maybe we are the aliens and we just havent left. We've seen all around the world of ancient artifacts that are out of place for their age. We've also seen the mega structures around the world that are thousands of years old, which back then look like an impossible task. The great pyramids of Egypt for example, each block weighing 2.5 tons each and not to mention there was 2.3 million blocks used. They say they were pulled on logs etc... yeah ok.
Here is a few pictures from the pyramids that look as if they had advanced technology.
Helicopter and spaceships?
Maybe we've had all this technology before but lost it due to a world war and had to repopulate and rediscover everything.
Size comparison of the universe
That's all for now, I'll add more when I have time.
Thanks for reading.