Pi Day 2021 a Far Cry from when Autism Was In the Media in the 20-Teens Yesterday was March 14, 2021. Also known as Pi day, for the mathematical 3.14159265359..., the ratio of the circumference of any circle to the diameter of that circle. Daniel Tammet, he of the book Born on a Blue Day and a man on the spectrum, holds the record for memorizing the first 22,514 digits. Tammet was in the spotlight in the 20-teens, the heyday of autism books, memoirs and society's fascination, interest and attention to autism. Age of Autism began publishing in the blog format in 2007. Dan Olmsted and Mark Blaxill were writing their deep dive into the origins of the epidemic together: The Age of Autism: Mercury, Medicine, and a Man-Made Epidemic.