By utilizing the brain and be alet.<br />
By reading.<br />
By socializing with intelligent people.<br />
By watching tv.<br />
I guess everything around us is a triger of intelligence if we were at the spot and our senses work well.
Be curious. Learn. The world is a buffet table of wonderful knowledge. Grab a plate and dig in.
What a wonderful analogy.
play brain games.
read everything. If something comes up and it interests you, even a little, google it to see what you can find on it. When you have filled your brain with that, sit and think on it.
Read and study subjects that interest you. Being a guitar pla<x>yer and a big fan of The Beatles, I was always intrigued about EMI/Abbey Road Studios. Over the past year and a half I have written an essay on the history of Abbey Road Studios and whenever I happen to come upon a website that touches upon that subject I add to my writings.
eat lots of fish.