We often hear the word "curator" in both the context of an art gallery and also as a sort of guru for every aspect of contemporary life, but the role of a curator is often hard to define. Curators are experts in their fields, able to identify what's hot now and what will be worth holding onto in the future. They do a lot more than just hang works of art on walls. We gathered information from the experts, including artists like John Baldessari and David Shrigley, as well as the curator of Serpentine Galleries, Hans Ulrich Obrist, to help define the slippery job title. Here are 18 Things Curators Actually Do.