1954 – The first mass inoculation of children against polio with the Salk vaccine begins.
http://en.wikipedia.org/wiki/Poliomyelitis
https://www.youtube.com/watch?v=3GXddGT8AKk

1945 – World War II: During the Battle of Iwo Jima, a group of United States Marines and a commonly forgotten U.S. Navy Corpsman, reach the top of Mount Suribachi on the island and are photographed raising the American flag.
http://en.wikipedia.org/wiki/Battle_of_Iwo_Jima
https://www.youtube.com/watch?v=pneTPAPVLFY
https://www.youtube.com/watch?v=AaJQkEEnGBo
https://www.youtube.com/watch?v=vHeB4dwNn7Q
https://www.youtube.com/watch?v=FuEFTqzCFg0
https://www.youtube.com/watch?v=QG1PvQHCTPI

1455 – Traditional date for the publication of the Gutenberg Bible, the first Western book printed with movable type.
http://en.wikipedia.org/wiki/Gutenberg_Bible
https://www.youtube.com/watch?v=5woYLVaF6uE
https://www.youtube.com/watch?v=g_MIkXORM0Q

1850 – César Ritz, Swiss businessman, founded The Ritz London Hotel and Hôtel Ritz Paris is born. (d. 1918)
http://en.wikipedia.org/wiki/C%C3%A9sar_Ritz
https://www.youtube.com/watch?v=D5DfoioiuLI

Produced by Meiqi AN