Since Donald Trump announced punishing tariffs on “Liberation Day” last week, stock markets have fallen and governments and businesses scrambled to respond. Our correspondent discusses the impact on the global economy. Do personalised diets really improve gut health (9:16)? And gasp at the science of how seals spend so long underwater without breathing (16:13). 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.