In calling the 1915 campaign against Armenians a genocide, President Joe Biden has rekindled tensions that never really faded—and has perhaps delayed a rapprochement. Chinese authorities fear religion, particularly when it is practised out of sight; we look at increasing repression of China’s tens of millions of Christians. And tracking the coronavirus’s spread by dipping into Britain’s sewers.

For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer