Let’s celebrate Albert Einstein’s birthday by chatting about atoms, because as we all know good things come in atomic packages. minutephysics explains how Einstein used observations of particles in water and Brownian motion to argue for the existence of atoms.
Now that you’re warmed up, sit back, open your ears and hang out with Richard Feynman while he thinks aloud about atoms and why they jiggle and how we perceive it as hot and cold. Few people could explain complex ideas as simply and enjoyably as Feynman. He was one coooool cat.