The brain expands and shrinks over time

I'm 58; dunno if I want to click through... Probably too depressing. :-(

See also: https://news.ycombinator.com/item?id=30942502 , https://news.ycombinator.com/item?id=30943370 .

(And, more tangentially: https://news.ycombinator.com/item?id=30920287 )