TED-ED: Particles and waves: The central mystery of quantum mechanics - Chad Orzel

One of the most amazing facts in physics is that everything in the universe, from light to electrons to atoms, behaves like both a particle and a wave at the same time. But how did physicists arrive at this mind-boggling conclusion? Chad Orzel recounts the string of scientists who built on each other's discoveries to arrive at this 'central mystery' of quantum mechanics.