Back in 1983, the BBC aired Fun to Imagine, a television series hosted by Richard Feynman that used physics to explain how the everyday world works. Here, in language that makes sense to anyone with a basic grounding in science, the Nobel Prize-winning physicist answered questions like, Why can’t tennis balls bounce forever? What are we really seeing when we look in the mirror? And, as shown above, why are rubber bands stretchy? The clip comes from Fun to Imagine, and thanks to this dedicated BBC website, you can watch online all six videos in the series, each running about 12 minutes. (If you have any difficulty viewing them at the BBC, simply watch the all-in-one video below.) But beware, Feynman's enthusiasm for science is contagious. So watch the clips at your own risk, and be prepared to start playing with bouncy, stretchy things during your free time, hopefully with a big smile on your face.