The athletics is underway, at last, and the three favourites Usain Bolt, Asafa Powell and Tyson Gay all came safely through their heats this morning.
This is the race everyone will be talking to in the build-up to Saturday’s final so we thought we’d give you the chance to sound like an expert without have to leaf through the record books.
Mitch Phillips, swimming’s favourite reporter , tells you five things you knew but may well have forgotten about the best race in the world. Click on the video above.
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