Rog Hanson, a retired teacher who in 2016 built an underwater shelter for Pacific seahorses off the California coast, may know more about the secretive creatures than anyone else. Hanson logs environmental conditions, dive duration and depth, visibility, moon phase, tide and UV ray index along with the location and behavior of each seahorse he sees, and he has contributed important scientific data.
Retired teacher might be world's foremost expert on seahorses
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