A blood cell known as a troublemaker for triggering the itch and inflammation in allergy attacks, the mast cell, can also calm down the flare-ups, researchers have found. The findings reveal that, in mice, mast cells help decrease skin damage over time from sun exposure or from poison oak.

When our hopes are threatened, we often turn to the marketplace for help. Can't fit into the gorgeous outfit you bought for your high school reunion? Trying to get pregnant? Want a bigger house but afraid you can't afford it? A new study argues that in situations like these, consumers are susceptible to "motivated reasoning." We believe what we want to believe about products that promise to help --- even if the arguments don't come from credible sources.