Is light a particle or a wave? Or both? Or neither? Learn how humans have defined light throughout history -- including our best attempts today -- in this classic episode of BrainStuff.

How Is Maillardet's Automaton Still Wowing Us After 200 Years?
09:28

How Do Tiny Capers Pack Such a Big Flavor Punch?
06:35

What Do A.M., P.M., and SOS Stand For?
09:18