Why do some adults get smarter while others don’t?

jennifer_bloom
Like my friend got very low grades in math in high school and did her MBA at an Ivy League school that rivalled Harvard about 18 years after finishing high school

I know another girl who could not make coffee or wash more than 2 dishes a week after a brain injury and now she writes better books than Shakespeare and has published 17 books in 5 years

When I was in university, I went from one class a semester and failing grades while studying 9 hours a day, to pure As and A+‘s while studying 4 hours a day, taking 4 classes a semester at the time, I once got an A+ in a class I spent 45 minutes a week studying and doing homework in and at least 1/3 of the class failed.

In high school also, I went from a D- in grade 10 math to an B+ in grade 12 math so my skills improved
Why do some adults get smarter while others don’t?
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