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FILE -- Ruth Gates with tanks of coral at the Hawai'i Institute of Marine Biology on Coconut Island off Oahu, Aug. 5, 2017. Gates, a renowned marine biologist who made it her life’s work to save the world’s fragile coral reefs from the deadening effects of warming water temperatures, died on Oct. 25, 2018, in Kailua, Hawaii. She was 56. (Logan Mock-Bunting/The New York Times)