In this photo, Lady Bird Johnson (1912-2007) sports an impressive bouffant. Big hair styles were popular in the United States during the 1950s-70s, so the First Lady's hair is not out of the ordinary.
But when, precisely, did big hairstyles reach their zenith in American fashions? Elle O'Brien, an AI researcher for Botnik Studios, and Jan Diehm, an engineer and journalist, crunched the numbers from 30,000 American high school yearbook photos.
At The Pudding, O'Brien and Diehm present an interactive chart showing the growth and shinkage of hairstyles for both men and women over time, as well as a decade-by-decade summary of the most common hairstyles for both sexes.
-via Marginal Revolution