When you cannot witness somethign with your own eyes, then it must be proven to have happened...else you will fall for anything...like ummm... america going to the moon.
So you would had to be on the mission to the moon to believe it?
HAHAHAHAHAHAHAHAHAHAHAHA
H
By your logic, you could be talking on the net to hundreds of computers controlled by the government instead of real people.

How do you know the earth is round?
How do you know all the places on Earth you haven't seen even exist?
HAHAHAHA
Like I said, your logic is flawed.
What a tard.