In super-slow motion, the world is a different place: Hummingbirds' wings flap slowly, water balloons explode gracefully, and a tuning fork -- not so exciting to watch at normal speed -- makes for a fascinating physics demonstration.
Just check out the video above, created by "The Slow Mo Guys." English filmmakers Gavin Free and Daniel Gruchy team up to show the world in slow-motion, and their videos often spotlight a specific aspect of science.
But why a tuning fork?
"When you dunk it in water, the frequency vibrates the water in a cool way," Free explains in the video. Skip to 1:07 to see the vibrations come to life.
What's the physics behind these tuning fork shenanigans? When struck, the double-pronged metal rod vibrates at a constant frequency -- and thus emits a constant pitch. The naked eye can't spot the vibrations, but dipping the tuning fork in water and slowing down the footage make them anything but invisible.