This Double Pendulum's Path Glows in the Dark
Who needs ordinary differential equations to determine the motion of a double pendulum?
All you need is a double pendulum, an ultraviolet LED and a backboard coated in photoluminescent pigment.
Watch what happens in the dark when a UV LED is attached to the double pendulum.
A new study proves there still must be a beginning to "bouncing" universes that go through cycles of expansion and contraction.