Science has a handle on fireflies and glowworms, but most bioluminescent animals live in the ocean and are tough to study. Today, researchers are still figuring out why some animals produce light. Dive with Josh and Chuck into this illuminating topic.

Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htm

And to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices