Solipsism Thread

How can I be sure that anything actually exists?
What if I'm just a brain in a vat and /prog/ doesn't exist?
What if I don't exist, and I only think I do?
What if you are the only person in the universe who exists?

>>1
The probability of you being a brain in a vat is far lower than you having emerged in a shared universe populated by beings like yourself.

Read the following paper for the proof:

http://arxiv.org/abs/physics/0001020