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Yet throughout history there have been times when everything came together just right for one single person to screw it all up.
FYI: This is just another care package of horrors mailed directly to your brain from the scientific community.
Statistics say about 80 percent of you out there have at least one brother or sister. That's turning out to be hugely important, as science says whether or not you have siblings, and what order you were born in, has massive effects on who you are. Often not so great ones to boot.