20th century 1900s. 1900 – Sigmund Freud published The Psychopathology of Everyday Life. 1903 – John B. Watson graduated from the University of Chicago; his dissertation on rat behavior has been described as a "classic of developmental psychobiology" by historian of psychology Donald Dewsbury.
20th century 1902 Rabbi Dr. Solomon Schechter reorganizes the Jewish Theological Seminary of America and makes it into the flagship institution of Conservative Judaism. 1903 St. Petersburg's Znamya newspaper publishes a literary hoax The Protocols of the Elders of Zion. Kishinev Pogrom caused by accusations that Jews practice cannibalism. 1905