Conspiracy theories including 9/11, landing on the moon, origin of AIDS etc

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I recently watched a film that was mainly regaring 9/11 and claimed that it wasn't a terrorist attack but really a plot and staged attack by the US govenment in order to be able to start a war to be able to able to make money by producing arms un-neccesarily. I have also in the past heard that things such as landing on the moon never happened but was all a massive hoax, and that AIDS was created in the 60's by governments to wipe out homosexuality and also the populations of 3rd world countries. Do you believe any of these claims? Do you think 9/11 was really terrorists or that we have landed on the moon? Or have you heard of any other crazy ones?