A 2nd Olympic pool has turned green

There's something in the water at the Rio Olympics: Yet another pool has turned deep, bright green. This time, it's the water polo pool. On Tuesday, when the diving pool at the Maria Lenk Aquatics Centre mysteriously changed colors, Olympic organizers and FINA -- swimming's international governing body -- offered competing explanations why. The water of the diving pool at right appears a murky green as the water polo pool at left appears a greener colour than the previous day.
Read more: http://www.cnn.com/2016/08/10/sport/rio-olympics-second-green-pool-trnd/index.html?source=Snapzu