![Elena Radkova and Kalina Yordanova of Bulgaria compete in the synchronised swimming preliminary duet free routine at the European Swimming Championships in Eindhoven, March 14, 2008. REUTERS/Wolfgang Rattay (NETHERLANDS Stock Photo - Alamy Elena Radkova and Kalina Yordanova of Bulgaria compete in the synchronised swimming preliminary duet free routine at the European Swimming Championships in Eindhoven, March 14, 2008. REUTERS/Wolfgang Rattay (NETHERLANDS Stock Photo - Alamy](https://l450v.alamy.com/450v/2ef4n92/synchronized-swimming-fina-olympic-games-synchronised-swimming-qualification-london-2012-test-event-olympic-aquatics-centre-london-18412-elena-radkova-and-kalina-yordanova-of-bulgaria-in-action-during-the-duets-mandatory-credit-action-images-matthew-childs-2ef4n92.jpg)
Elena Radkova and Kalina Yordanova of Bulgaria compete in the synchronised swimming preliminary duet free routine at the European Swimming Championships in Eindhoven, March 14, 2008. REUTERS/Wolfgang Rattay (NETHERLANDS Stock Photo - Alamy
![Elena Radkova and Kalina Yordanova of Bulgaria compete in the synchronised swimming preliminary duet free routine at the European Swimming Championships in Eindhoven, March 14, 2008. REUTERS/Wolfgang Rattay (NETHERLANDS Stock Photo - Alamy Elena Radkova and Kalina Yordanova of Bulgaria compete in the synchronised swimming preliminary duet free routine at the European Swimming Championships in Eindhoven, March 14, 2008. REUTERS/Wolfgang Rattay (NETHERLANDS Stock Photo - Alamy](https://c8.alamy.com/comp/2EF5APX/synchronized-swimming-fina-olympic-games-synchronised-swimming-qualification-london-2012-test-event-olympic-aquatics-centre-london-18412-elena-radkova-and-kalina-yordanova-of-bulgaria-in-action-during-the-duets-mandatory-credit-action-images-matthew-childs-2EF5APX.jpg)
Elena Radkova and Kalina Yordanova of Bulgaria compete in the synchronised swimming preliminary duet free routine at the European Swimming Championships in Eindhoven, March 14, 2008. REUTERS/Wolfgang Rattay (NETHERLANDS Stock Photo - Alamy
![Kate CAMPBELL | Research Biogeochemist | PhD | United States Geological Survey, Colorado | USGS | Geology, Geophysics, and Geochemistry Science Center | Research profile Kate CAMPBELL | Research Biogeochemist | PhD | United States Geological Survey, Colorado | USGS | Geology, Geophysics, and Geochemistry Science Center | Research profile](https://i1.rgstatic.net/ii/profile.image/272348712534065-1441944401739_Q512/Kate-Campbell-4.jpg)