There was a time on the Earth where there were, at least, four different human species at the same time. Homo sapiens, Homo Neanderthalensis, Homo denisova and Homo floresiensis.
I think it's 10^8 instead of 108. That way it would make sense.
#4 somehow doesn't make any sense
The national nut is Trump
Technically, everything you see & hear is from the past.