Only one scientific study has shown those results. The people involved later admitted of falsifying evidence and were shunned from the scientific community.
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Well there's certainly SOMETHING out there making our kids retarded these days and it's not bad genes. (Well for some yes but no way are there just that many people living here with shitty DNA) and the sad part is we can manipulate DNA to make sure our kids don't come out retarded but it's "unethical".