When you think of an expert or specialist, you might picture a scientist with a lab coat and test tubes. Science likes to claim that its knowledge applies everywhere – like gravity or evolution – which makes scientific knowledge superior to local knowledge about one specific place. But Paige West points out that in practice scientists rely heavily on local people’s knowledge, for example the specialist knowledge that indigenous people in Papua New Guinea have about the fish, plants and ecosystems of their area. In fact, such local knowledge has proven to be crucial for successfully combating major problems like climate change.