We have lost a full standard deviation of intelligence above the Hajnal Line in the past 150 years due to reversal. We’re just about to cross the line of 97 in the USA, and evidence is that 95 and 93 are cliff effects that are unrecoverable. That’s before personality trait diffs.
Source date (UTC): 2020-02-16 17:24:35 UTC
Original post: https://twitter.com/i/web/status/1229094235783258113
Reply addressees: @drjulie_b
Replying to: https://twitter.com/i/web/status/1228972722061021184
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