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Covid definitely had a strong immediate negative impact on kids' education, but the trend of children struggling more in school over time is older than that. Until recent decades, there was an observed increase in children's IQ over later generations, called the Flynn effect. Children were on average expected to be 3-5 points higher in measured IQ than those born a decade earlier. But we have reversed that trend after peaking somewhere around the 80s. There are likely a lot of contributing factors, but they should all be environmental rather than genetic. So hopefully later generations will be able to reverse the trend again and support their kids' development in ways their own parents had neglected.