The slide notes that the heaviest use of Roundup, Monsanto's flagship weedkiller, began in 1990 and continued to rise since. Meanwhile, the number of kids with autism has gone from 1 in 5,000 in 1975 to 1 in 68 today, a puzzling and frustrating stat that shows no signs of slowing down and one that correlates strongly with the rise in glyphosate use.