What if Earth grew 1cm every second?

What if we put a pool on the moon?

What if everyone jumped at once?

What would happen to the population if the Earth suddenly stopped spinning?

Why Space is Actually Warm - Nuclear Engineer Reacts to XKCD

What if you drained the oceans?

What if all the lightning on Earth struck the same place at once?

What if the Moon were made entirely of electrons?

What if everyone pointed a laser at the moon?