In a Shanghai laboratory, scientists have crossed a threshold that quietly redraws the boundary between medicine and biology — engineering a living microorganism to sense rising blood sugar and respond autonomously, without a needle or a schedule. The work, emerging from East China Normal University and published in Nature, addresses one of modernity's most burdensome chronic conditions: diabetes, which now touches more than 530 million people worldwide and shows no sign of retreating. Rather than asking patients to manage their disease, the researchers have created something that manages it f