This video, Open Letter to the Universe, is the home of one of my favourite YouTube channels. These short videos were recommended to me by one of the students I tutor in physics and mathematics. They touch on a wide range of very fundamental concepts. Each presentation is simple and clear but they all move quickly so be prepared to play them a couple of times. It will be worth it, even if only to catch some of subtle humour that is easy to miss the first time. What I like best about Open Letter to the Universe is the part about how nature itself is the final arbiter of all scientific disputes.

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