Watch SciShow Creator Hank Green battle brains with SciShow Writer Ceri Riley.

We often think of the ocean as a pretty serene, lovely place to relax. But it turns out there's quite a racket going on under the waves, and some of the culprits are not the animals you'd expect!

Jessi tackles some more questions from viewers: How did Kemo get his name, snake bites, pick 1 animal, and sick fish.