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These sound like good points to bring up with him.Â As it's not my math, I can't help you there.Â You might want to check ASPO.org or one of the other sites, they are official organizations - Matt Savinar's site just happens to have everything in one place, hence my links to it.
"Everything" isn't so good if it mostly includes junk science and conspiracy theories!
"I'm trying to free your mind, but I can only show you the door. You're the one that has to walk through it."- Morpheous, The Matrix