In 1936, he started to continuously revise the encyclopaedia often (still done so today), in which every article is checked at least two times every ten years. This was a big difference from before, when the articles were not changed until they wrote a new edition, about every 25 years, with some articles used again without revising them. He also quickly made some educational products which made the encyclopedia even more well known by everyone. In 1943, William Benton managed the "Britannica" until his death in 1973. Benton also set up the Benton Foundation, which managed the "Britannica" until 1996. In 1968, near the end of this era, the "Britannica" celebrated its 200-year anniversary, and in 2014 published the last printed edition.