It really is silly to believe that another form of life has visited earth, but yet somehow managed to leave no solid evidence of such. Based on our current understanding and knowledge of the universe and our technological capabilities, it would take hundreds of years for another life form to travel from their planet to ours. To believe a species would invest the time, effort, and loss of life to make that trip, only to get here and not even say hello or blow us up for the hell of it, is quite comical to say the least.
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