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A comment on Children of a Thailand tribe who see with clarity beneath the waves (2016). Parent comment

Re:Children of a Thailand tribe who see with clarity beneath... by soperj on Thursday August 29, 2019 @11:49PM (#20835843)
How did they measure the clairity of the water to make sure they were the same?
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Re:Children of a Thailand tribe who see with clarity beneath... by Jackim on Friday August 30, 2019 @07:50AM (#20837646)
A Secchi disk is a pretty reliable way to measure water clarity.
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