"If time travel was possible, where are all the time travellers from the future? They would be everywhere."
Just saw a program on this on the Discovery Channel. Looks like time travelers enter a parallel universe so we wouldn't see them.
I have a time machine, but it is currently stuck in forward gear at 1x speed. It is hard to get the overthrusters I need to repair it here in the 21st century.
That's true. That's exactly how time travel works.
Also, did you know that adding cream to coffee releases huge amounts of deadly radiation? It's true. Fortunately the byproducts of this chemical reaction enter a parallel universe so we wouldn't be killed by them.