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Visit one, and then come back and tell people. And they call you insane, you don't know what you're talking about, here's what science really says, you need to go back to school until you learn basic science, you moron.

[shrug] I haven't seen one yet, so... Maybe someday. I guess the proof is subjective?

I have changed my past. Did it all in my mind. (or maybe all with my mind). But people remember the new past. And like Mandala effects, people doubt it is real thing. And you are just crazy for remembering things wrong.