A Review of Secchi’s Contribution to Marine Optics and the Foundation of Secchi Disk Science
By Jaime Pitarch

Life in Internal Waves
By Jessica C. Garwood, Ruth C. Musgrave, and Andrew J. Lucas

Advancing Ocean Observation with an AI-Driven Mobile Robotic Explorer
By Aya Saad, Annette Stahl, Andreas Våge, Emlyn Davies, Tor Nordam, Nicole Aberle, Martin Ludvigsen, Geir Johnsen, João Sousa, and Kanna Rajan

The Story of Plastic Pollution: From the Distant Ocean Gyres to the Global Policy Stage
By Chelsea M. Rochman

QUARTERDECK • Reflections
By Ellen S. Kappel

FROM THE PRESIDENT • Ocean Sciences During the Fall Season: The End and the Beginning
By Martin Visbeck

RIPPLE MARKS • Turn Off the Lights: Artificial Light at Night, a New Threat to Beleaguered Coral Reefs
By Cheryl Lyn Dybas

COMMENTARY • Equity and Safety in Polar Oceanography? Let’s Start with Equal Chances of Survival. Literally.
By Anna Glüder

COMMENTARY • Maury for Modern Times: Navigating a Racist Legacy in Ocean Science
By Penelope K. Hardy and Helen M. Rozwadowski

COMMENTARY • Integrating Oceanographic Research into High School Curricula: Achieving Broader Impacts Through Systems Education Experiences Modules
By Mónica V. Orellana, Claudia Ludwig, Anne W. Thompson, and Nitin S. Baliga

COMMENTARY • Lessons Learned from Running a Conference in the Time of COVID-19 and the Silver Linings of Shifting to Online
By Hannah E. Power, Madelaine S.S. Broadfoot, Annette Burke, Paul M. Donaldson, Rosanne M. Hart, Kendall C. Mollison, David J. Schmidt, and Stuart M. Young

HANDS-ON OCEANOGRAPHY • Sound and the Seafloor: Determining Bathymetry Using Student-Built Acoustic Sensors
By Robert Levine, Sasha Seroy, and Daniel Grünbaum

THE OCEANOGRAPHY CLASSROOM • A Viral Shift in Higher Education?
By Simon Boxall