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Sharks have been celebrated as powerful gods by some native cultures. And today, sharks are recognized as apex predators of the world’s ocean. What is it that makes these fish worthy of our ancient legends and so successful in the seas? Tierney Thys takes us into the ocean to find out.

Communicating underwater is challenging. Light and odors don’t travel well, but sound moves about four times faster in water than in air — which means marine mammals often use sounds to communicate. The most famous of these underwater vocalizations is undoubtedly the whale song. Stephanie Sardelis decodes the evocative melodies composed by the world’s largest mammals.

Learn how to make a breathing machine from the author of Maker Lab, Jack Challoner. This easy experiment uses household items to construct model lungs and show how some vital parts of the body work.