They had cold-fusion engines, space****ps and time-machines
10000 years ago!
Unfortunately, they also had WMDs that could corrupt time
and matter and one day they eradicated themselves and
that's the proof of their existence :
Any advanced society, on Earth or elsewhere, will develop
WMDs one day that are powerful enough to wipe out their
entire civilization. Non-existence of ancient super-civilizations
proves that they existed, because only a super-civilization
can destroy itself totally!
What do you think about my theory?
