So, you know how everyone has always told you that dandruff is caused by, like, dry skin or dehydration? It turns out that's not exactly true. It's actually caused by Malassezia globosa, a fungus that grows (and likely sexually reproduces) on the skin of between 50 percent and 90 percent of people. Malassezia globosa also causes eczema and skin infections in newborns. The fact that it sexually reproduces is new (if grody) information that scientists can use to potentially produce more effective dandruff shampoos (which is why the research was conducted by Proctor and Gamble Beauty). [Yahoo News]