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It's a race against time for the rare Northern White Rhino - with one of only 4 remaining animals dying in captivity in at the San Diego Zoo today. Nola who was 41 had to be put down after developing an infection.Can scientists develop a workable test tube fertilisation method before the last three die? (PIcture -Nola receiving medical care at San Diego Zoo in 2014. REUTERS/Ken Bohn/San Diego Zoo Safari Park)