Corey Powell
98: That’s how many humans it would take to start over on another planet
Are we too vulnerable to asteroid strikes and other cataclysms to stick with our single planet? … Frédéric Marin is ...
What if we find an alien civilization 500 years behind us in technology and advancements?
We couldn’t communicate with them by any currently known method. Unless physicists make some kind of wildly unanticipated new discovery, ...
