Can we teach computers some common sense? A band of scientists in Seattle is giving it a try, one standardized science test at a time. One night, a 7-year-old boy woke up in the middle of the night and tore up the flooring in his bedroom. He stabbed a knife through a wall. He tried pulling his teeth out. Now scientists are learning more about infections that can turn kids' immune systems against their brains, dramatically altering their behavior. The race is on to find a cure.
Today, we know there are thousands of exoplanets—old news, right? Wrong. There's reason to remain excited, because the best is yet to come. Plus: the physiology of reconnecting with an old flame; evidence of ancient conflicts opens old wounds; and a man's health suffers after he starts pumping iron.