Welcome to the ocean -- where your genitals are on your face, males give birth, and gender is more of a suggestion than a rule. You can snooze in a bubble of your own vomit or switch sexes overnight without anyone batting a fin. What a world!

This week we’re joined by Mike Scotland - marine biologist, underwater photographer, and editor of DiveLog Magazine. With 50 years of diving, thousands of dives, and two books under his weight belt (Marine Biology in the Wild and Diving With Sharks), Mike’s here to tell us why humans have more in common with flatworms than we’d like to admit -- and how to keep your spines clean if you’re a sea urchin. Dive in!

Thumbnail Image: Gold-speckled flatform (Thysanozoon nigropapillosum)

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