There’s a fascinating link between geniuses and eccentric behavior. Einstein picked cigarette butts off the street and used the tobacco for his pipe; Benjamin Franklin sat naked in front of a window every morning and let the air circulate over his body. He called it an “air bath.” Their eccentricity isn’t completely without explanation; there are mental benefits behind some of their madness. Here are 8 quirky habits from geniuses that will make you smarter: 1. Make love. A lot. Emilie du Châtelet went…