Students identify the different organ systems found throughout the human body. Using a model, they explain and draw the flow of blood and name the parts of the circulatory system. They create their own circulation city in which to show...

What if invisibility wasn't just the stuff of epic comic book stories? Is it scientifically possible to be invisible? In this series, creator Joy Lin tackles six superpowers and reveals just how scientifically realistic they can be. [4:33]