Giant Salvinia, that is—a South American invader that swallows up and suffocates lakes. One of the world’s most noxious aquatic weeds, according to The United States Geological Survey, Salvinia can to double in size every two to four days and cover 40 square miles within three months, killing all life beneath it. Right now, Texas is battling the plant as it tightens its grip on the South’s largest natural lake. Check out the full story in the New York Times.