The fight against fentanyl, a synthetic opioid, is at the heart of America and China’s trade-war truce. But China’s efforts to tackle the problem ease up whenever the relationship sours https://t.co/pxtA2RWLRwIllustration: The Economist/Getty Images https://t.co/knDw9ZGXvr ...

Nitazenes can be 25 times more potent than fentanyl—and hundreds of times stronger than heroin. “Babbage” asks what to do about the rise of a new opioid https://t.co/mYNXjrDmvl ...