As most of you know, LED bulbs use way less power than incandescent bulbs. (The U.S. Department of Energy says at least 75% less power; Consumer Reports puts the figure at 80%.) That's because incandescents wastefully transform most of the incoming energy into heat, whereas LEDs are efficient enough to transform most of that energy into light.
That's easy for us adults to grasp, maybe not so easy for a child. Hence the Franklin Institute, Philadelphia's science museum dedicated to the fellow on our C-notes, has installed this simple demonstration machine:
Whatever exhibition designer came up with that should be lauded. I really hate that things like this go uncredited. And speaking of credit, the video has been attributed to the Instagram account AndysTechGarage; I couldn't find it on his page (the man has over 2,000 posts) or I'd have embedded it.