Everyone gets stressed out now and then, and some stress is healthy. Say a dad sees his toddler toppling off a play structure. His brain releases chemicals that trigger other reactions in his body, giving him a burst of energy to dash to his daughter before she hits the pavement.

But neuroscientists have found that too much stress can hurt a part the brain’s hippocampus, which plays a key role in memory. Neuroscientists are working on treatments for stress -- but the best remedy may be to just mellow out. If you major in neuroscience, you’ll study stress, memory, and other mysteries of the brain and nervous system.