US women's quartet go down in history

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The United States have won the women's 4x100m gold medal in a world record time of 40.82 seconds.

The US team of Tianna Madison, Allyson Felix, Bianca Knight and Carmelita Jeter raced away from their closest challengers Jamaica to take gold and beat the East German record from 1985 which is one of the longest marks on the record books.
Jamaica's quartet broke their national record with a 41.41 run, but it still was not quick enough to beat the Americans who led from the start.
Ukraine (42.04) also broke their national record for bronze.
Russia's Tatyana Lysenko has won gold in the women's hammer in an Olympic record of 78.18m.
She led all the way through the competition, having thrown 77.56m with her first attempt, before going even further with her penultimate effort.
Poland's Anita Wlodarczyk took the silver with a final throw of 77.60m and China's Zhang Wenxiu the bronze with 76.34.
Asli Cakir Alptekin took gold in the women's 1,500m as the British challenge failed to materialise.
The Turkish athlete won a slow race in 4:10.23, finishing ahead of compatriot Gamze Bulut, with Bahrain's Maryam Yusuf Jamal third.
Lisa Dobriskey, for whom reaching the final was some achievement having battled back from potentially life-threatening blood clots on her lungs, was 10th in 4:13.02 and Laura Weightman, in her first major championship, 11th in 4:15.60.
Dobriskey told the BBC: "I found myself in the wrong place. You have to be right on it when they go and I was too far back.
"I knew the other girls were very strong and it would have been very hard to have got a medal."
There was more agony for American Morgan Uceny as she fell for the second major final in succession, having also hit the track at last year's World Championships in Daegu when she was one of the favourites.
France's Renaud Lavillenie took gold in the pole vault in an Olympic record 5.97m.
Germany's Bjorn Otto was second with 5.91m, ahead of fellow countryman Raphael Holzdeppe on countback.