The latest numbers from the Center for Disease Control showing a steep rise in the number of children with autism are so off the charts that it’s hard not to come to one of two conclusions: There’s something wrong in the way that we measure the data or there’s something extraordinary going on. 1 in 68 American children now has autism, up from 1 in 88 children just two years ago, an increase of 30 percent. A decade ago, one in 166 children were diagnosed as having autism. In 1975, it was 1 in 5000. Plot this as a graph using CDC data and you get a hockey stick curve showing exponential growth in autism over just the past decade.