Since May, the number of monkeypox cases has grown to more than 16,000 across 75 countries and territories. The World Health Organization is worried about how quickly the virus is spreading among men who have sex with men — the group experiencing the vast majority of cases. And there are no signs that the outbreak is slowing down. The overall numbers are now doubling every two to three weeks, with cases climbing a little faster in the U.S. […]