15 Ways Women Are Tougher, Luckier, and Smarter Than Men

We Have Stronger Immune Systems

A 2009 study by scientists at McGill University indicated that women have a built-in mechanism to protect from infection. Estrogen naturally found in our bodies suppresses an enzyme that interferes with our defense system. These findings may inspire estrogen-based treatments to boost immunity in those (ahem, men) who don't already possess the hormone.