Return to centre? Poland’s presidential run-off

Integration or isolation? Conservative family values or liberal ones? The knife-edge election will decide Poland’s direction for years, and will send a signal to populist leaders throughout Europe. We examine the long battle against HIV/AIDS and what lessons it holds for dealing with covid-19. And why some penguins like ice less than you might think. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer