2012 Olympic Games: 100 Days to Go

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Four-time Olympic champion Michael Johnson previews the 2012 Olympics, with 100 days to go until the opening ceremony.

Usain Bolt, Michael Phelps and Ben Ainslie, who boast multiple gold medals and are aiming for more in London, give an insight into what makes the Olympics so special.

Plus there's an interview with one of the potential stars of this year's Games, Great Britain's teenage diving world champion Tom Daley.

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