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Why has one of the Olympic pools turned green?

The water at the Maria Lenk Aquatics Centre has turned green for the women's synchronised 10m platform final. The 91热爆 Brazil's Jefferson Puff was there and looks at how the athletes are reacting.

(Picture: General view of the diving pool at Maria Lenk Aquatics Centre on Day 4 of the Rio 2016 Olympic Games on August 9, 2016 in Rio de Janeiro, Brazil; Credit: Getty Images)

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