[say]

Sometimes I feel like I've become less intelligent from when I was a teen till now (in my 20s). I think I had more challenges back then. Mental and emotional, which kinda kept my mind busy, ready.
The high school was more intense than college to me. I kinda miss the math too, because it kept me mentally focused, fit.
I think the mind needs some exercise, just like the muscles, to stay fit. Also focus helps a lot and I'm already working on that.

What mind work do you recommend, that would stimulate the mind in a 'good' way? Should I just do some math excercises? (I hope there's something more entertaining, tho...)