1920's Timeline By BlackJesus69 Jan 1, 1920 First Commercial Radio Broadcast Aired Jan 1, 1921 Lie Detector Invented Jan 1, 1922 Tomb of King Tut Discovered Jan 1, 1923 Charleston Dance Becomes Popular Jan 1, 1924 First Winter Olympic Games Jan 1, 1925 The Scopes Trial Mar 7, 1926 First Woman to Swim the English Channel Jan 1, 1927 Babe Ruth Makes Home Run Record Jan 1, 1928 Bubble Gum Invented Jan 1, 1929 First Academy Awards