from regular verbs (regularity>50%). Six verbs became Fig. 5. Culturomics provides quantitative evidence for regular (upper left quadrant, blue), while two became scholars in many fields. (A) Historical Epidemiology: irregular (lower right quadrant, red). Inset: the regularity of “imfluenza” is shown in blue; the Russian, Spanish, and Asian “chide” over time. (G) Median regularity of verbs whose past flu epidemics are highlighted. (B) History of the Civil War. tense is often signified with a -t suffix instead of —-ed (burn, (C) Comparative History. (D) Gender studies. (E and F) smell, spell, spill, dwell, learn, and spoil) in US (black) and History of Science. (G) Historical Gastronomy. (H) History UK (grey) books. of Religion: “God.” Fig. 3. Cultural turnover is accelerating. (A) We forget: frequency of 1883 (blue), 1910 (green) and 1950 (red). Inset: We forget faster. The half-life of the curves (grey dots) is getting shorter (grey line: moving average). (B) Cultural adoption occurs faster. Median trajectory for three cohorts of inventions from three different time periods (1800-1840: blue, 1840-1880: green, 1880-1920: red). Inset: The telephone (green, date of invention: green arrow) and radio (blue, date of invention: blue arrow). (C) Fame of various Oo personalities born between 1920 and 1930. (D) Frequency of S the 50 most famous people born in 1871 (grey lines; median: Se dark gray). Five examples are highlighted. (E) The median ‘i trajectory of the 1865 cohort is characterized by four 8 parameters: (1) initial “age of celebrity” (34 years old, tick 6 mark); (ii) doubling time of the subsequent rise to fame (4 & years, blue line); (iii) “age of peak celebrity” (70 years after S birth, tick mark), and (iv) half-life of the post-peak D “forgetting” phase (73 years, red line). Inset: The doubling me time and half-life over time. (F) The median trajectory of the © 25 most famous personalities born between 1800 and 1920 in ® various careers. F Fig. 4. Culturomics