As Democrats convene in Chicago, polls suggest Kamala Harris is ahead by a whisker in the US presidential race. Can the party sustain the momentum? In hospital, your recovery may depend not just on diagnostic technology or the drugs you take, but whether your doctor is a woman (10:11). And new research into elephant communication suggests the creatures may have something akin to names (16:34).Listen to what matters most, from global politics and business to science and technology—Subscribe to Economist Podcasts+For more information about how to access Economist Podcasts+, please visit our FAQs page or watch our video explaining how to link your account.  Hosted on Acast. See acast.com/privacy for more information.