Impossible Kid, The

Firstly, it does not believe any photos because they can be counterfeited or falsified.

Second, he does not believe in all mathematical problems due to government conspiracy.

and third, he believes there is a universal gravitation, not that the earth has its own gravity.

Help! I just want him to shut up for once and prove him wrong.

discard the other end of the earth if he thinks his apartment

You can not prove it, you can PROOF. People are not convicted of crimes based on evidence (in general). Until he sees with his own eyes, this is not proof Flag

He thinks that mathematics is a conspiracy? There is no way to convince him he's wrong. He did not come to its conclusions thanks to the logic, if no amount of logic to talk to them. It is simply ignorant, and there is probably not what you can do about it.

Tell him that if the earth are not around we'd fly straight to the world if we tried to fly around the world. If he accepts, then tell him that Amelia Earhart flew across the world in a certain amount of hours. You can view it. Tell him to find.

Drop him into space on a spacecraft in Area 51.

You can not prove it to him because he does not accept any of the evidence. Just forget it. If you want him to quit and stop talking to him about it or ignore it if it brings. I think it must be just playing with you anyway.

Ask the child when he overlooks the ocean and watch a ship sailing from there one minute, you can see the bottom of the boat, then the next minute you can barely see the top.

Ask him what causes this?

This happens because the earth is round.

Take him to the ocean and watch a sailboat in the distance.
Let him see a Foucault pendulum in action.
Time zones and why noon in the City of New York is not yet noon in London or Tokyo -
http://en.wikipedia.org/wiki/Time_zone
Geodesy, the study of the shape of the Earth -
http://www.iag-ggos.org/
http://www.iag2009.com.ar/

Or, explain how the sunrise and sunset work with the motion of planets (planets inside and outside), so we do not see more than a few miles in a straight line (ocean view or large Lake).

Study supermarket are raised and how the areas are made large maps

I admire his skepticism, but it seems a bit impossible. Why not make the same experience as the only Egyptian or Greek guy did with the shadows? You know, when you get closer to the equator and the shadows are shorter? It would be difficult to deny the visual evidence, I think.

It sounds like the guy who does not accept something just because it is said that (I understand Einstein was the same way) - he must show that he can teach his account. Here are some possible tactics:

1) Obviously, a plane at an altitude clearly shows the curvature of the Earth. But I'm assuming that this is not available. But there are other ways:

2) Take it to a marina. Watch the boats as they go to sea - note that the boats withdrew, they do not just getting smaller (as would happen if the Earth was round, NOT), but also fewer mast is visible until all we see is only the tip of the mast.

3) Put him on the phone with someone he trusts who is traveling in a remote zone. Choose your moment to call carefully. When.