I found a cool online calculator that purports to calculate the number of population participants needed in order to get your desired confidence level. It might come in handy. (although I cannot guarantee its accuracy)
http://www.custominsight.com/articles/random-sample-calculator.asp
Green sea turtle gets relief from “bubble butt” syndrome thanks to 3D
printing
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Boat collision left Charlotte stranded at the surface and in danger of
predation.
22 hours ago
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