Want to become a superhero, kids?  Stay on heroin.

According to National Geographic, the leading causes of nerd boners are:
1. Natalie Portman
2. Pictures from Upcoming Comic Book Movies
3. Stiff Breezes

There, I helped you with the second one.  For numbers one and three, I recommend google image search and standing outside.  But be careful: experiencing all three at once could create an unhealthy drop in blood pressure.