Ten years ago, researchers proved that adding full memory can theoretically aid computation. They’re just now beginning to understand the implications. Mark Belan/ Quanta Magazine Introduction “Obviously” is a dangerous word, even in scenarios that seem simple. Suppose, for instance, you need to do an important computation. You get to choose between two computers that are almost identical, except that one has an extra hard drive full of precious family photos. It’s natural to assume that the two...