Hawai’i Ocean Observing System’s series of public talks highlights what UH-Manoa researchers are learning about Hawai’i’s waters. Talks are at 6 p.m. every second Wednesday at Outrigger Waikiki on the Beach. www.hioos.org. Free. Validated parking is $5. ph: 923-0711.

“Water Quality and Health of Hawai’i’s Coastal Recreational Waters,” Grieg Steward, assistant professor, Department of Oceanography, UH-Manoa.