Leprosy can be caused by two species of bacteria, Mycobacterium leprae or Mycobacterium lepromatosis nobeastsofierce Science/Alamy A form of leprosy affected people in the Americas long before the arrival of Europeans, contrary to popular belief. “The narrative around leprosy has been always been that it’s this awful disease that Europeans brought to America,” says Nicolàs…

“People just moan about the weather forecast and how bad it is…” Erik AJV/Alamy “It’s an absolutely unbelievable scientific achievement,” says Andrew Charlton-Perez, talking to me by video from his office at the University of Reading, UK. His colleague, Simon Driscoll at the University of Cambridge, nods enthusiastically. “There are so many different applications and…