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i have been thinking about this a great deal the last couple days...i really don't know what the answer is...i have hopes that it is not number 5, and i am 21 yrs old

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I think about it all the time, and I also strongly hope it is not number 5. I am 18.

However, there is a lot of science that kind of does support number 5, whereas the other theories are kind of less reilable.

I would like to think that any of 1,3 or 4 are possible.

Maybe it depends on type of person you are.