I had posted this a few years back but it didn't get noticed back then. Posting again because this video is exemplary in its clarity and it's a topic the HN cro

I had posted this a few years back but it didn't get noticed back then. Posting again because this video is exemplary in its clarity and it's a topic the HN crowd might like. This is also one of the best science education videos I've seen and I keep coming back to it every few years.