I doubt slightly more athlete's foot or head lice, for example, are doing much to IQs
Some people are definitely smarter than others, right? Is this something measurable? Have you ever noticed that the dumb people tend to have dumb kids and parents? Do you really think the differences are all cultural/environmental/education/parenting?
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I don't think anyone can really know the percentages given we don't even really understand intelligence to a strong degree yet. Assuming 100% in either direction is probably wrong.
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Sure, but the evidence we do have on intelligence variation points to largely genetic causes, and this should line up with personal experience.
End of conversation
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