In 1907, Robert Baden-Powell formed a boy leisure group which he called 'Boys Scouts' which was where boys participated in various activities. Three years later, girls guides (similar to boys scouts) were formed.
First crossword invented
Radio-broadcasting began
Television began in 1936
Video Recording and computers began in the 1980s
Internet came about in the late the 1990s
Gardening became very popular in the late 20th Century