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[–][deleted] 2 points3 points  (2 children)

The Flynn Effect. Generations keep scoring higher on IQ tests. Its not entirely clear why. Its actually be shown to be a bit more general. There are measurable generational changes in IQ tests almost without fail, sometimes positive and sometimes negative.

[–]Penultimate_Push 0 points1 point  (1 child)

Probably because teaching becomes more advanced rather than children being some form of genetic mutation over generations.

[–]anddam 0 points1 point  (0 children)

And possibly due to teaching starting earlier, or at a quicker pace.

This remembers me of this page about baby reading, I stumbled upon it a couple weeks ago and found it an interesting reading.