: Oceans cover nearly 75% of the Earth. While they seem vast and frightening, they’re also enchanting and whimsical. On this week's show, TED speakers dive into stories of connection—and even love—in the sea.

Catherine Mohr shares the story of a scuba diving trip gone wrong, where getting stabbed by a sea urchin transformed her relationship with the ocean... and ultimately led her to the love of her life.

Marine biologist Marah Hardt is fascinated with the mating habits of marine life. If we want to save the oceans, she says we have to understand the weird and whimsical sex that helps populate it.

Marine biologist Ayana Elizabeth Johnson is obsessed with one research subject — the parrot fish. She says there is urgent work to be done to save them and their home, the coral reefs.

Cone snails are deadly sea predators; their venom can kill fish and even humans. But chemical biologist Mandë Holford says that powerful venom can actually be used for good--to treat human diseases.