Sometimes a show ends, and you think that was it. You saw the twist and the finale and the full story. But then someone brings up a theory, and everything changes.

Lauderdale-By-The-Sea is the old-fashioned beach town of our dreams.

Eventually, researchers caught several “transparent” nudibranchs, or sea slugs, that didn’t look like anything they’d seen before. They looked closer at these animals, analyzed their DNA and realized ...