A limber brain craves variety. I have always read voraciously (~3000 books in the last 60 years), changed majors 3 times as an undergrad and just got my 2nd graduate degree to start my new career. I cook, build furniture, collect minerals, act, make music, and write in multiple genres.

A day when I don't learn something interesting is a day wasted. Fortunately, such days are also rare.

Use it or lose it.