How can you increase your intelligence?

Short answer is: Curiosity 

-=-=-=-=-

Curiosity feeds the intelligence, I had a conversation with one of my friends about string theory, our other friend stood there confused, after we noticed him, he asked us, what are you talking about, and WHY, and where did you get all this information? the only answer that I could come up with is, curiosity. If you are curious enough, you will seek knowledge, and thus increasing the intelligence.

Practicing psychological question, games, case study, etc.

1. Brainstorming.

2. Case study.

3. Game.

4. Facilitating.