Kari Byron powers up a digital clock with a can of sauerkraut, and explores the science of sound with rock group Metallica.Find out what chopped liver and hydrogen peroxide can do, and how rust can be good for you. Hummingbirds hover, and mummies are made.

What happens when you put a flame to a water-filled balloon? How do elephants hear? And what happens to entire countries during earth-shattering tectonic plate movements? Find out as Head Rush host Kari Byron asks these and other fascinating questions.