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. -- Learn about the respiratory track hands on, at home!
White House approves International Space Station extension until Here, NASA astronaut Mike Hopkins participates in the second of two spacewalks on the exterior of the International Space Station. (Photo from NASA/REX FEATURES/AP)