1984 - Women's marathon is added to the Olympic games in Los Angeles.

2008 - The women's 3000 meter steeplechase debuts as an Olympic event.

Badminton

1992 - Badminton is added to the Olympics in Barcelona.

Baseball

1992 - Baseball is added to the Olympics in Barcelona.

2012 - Baseball is dropped from the Olympics in London.

Basketball

1904 - Basketball is an exhibition event at the Olympics in St. Louis.

1936 - Men's basketball is added to the Olympics in Berlin.

1976 - Women's basketball is added to the Olympics in Montreal.

1992 - Participation rules are changed to allow professional basketball players to participate on the Olympic teams.

Boxing

688 B.C. - Boxing is added to the ancient Olympic games.

1896 - A committee decides that boxing is too dangerous for the modern Olympic games.

1904 - Boxing is added to the Olympic games in St. Louis.

1912 - Boxing is eliminated from the Olympics in Stockholm due to a law banning boxing in Sweden.

1920 - Boxing is added again to the Olympics in Antwerp.

2012 - Women's boxing makes its debut at the London Olympics.

Canoeing:

1924 - Canoe/kayak flatwater racing is an exhibition event at the Olympics in Paris.

1936 - Men's canoe/kayak flatwater racing is added to the Olympics in Berlin.

1948 - Women's canoe/kayak flatwater racing is added to the Olympics in London.

1972 - Canoe/kayak slalom racing is added to the Olympics in Munich 1992 - Canoe/kayak slalom racing is a competition in the Olympics in Barcelona for the first time since 1972.

Cycling