3Blue1Brown

A visual introduction to probability's most important theorem

Where's the circle? And how does it relate to where e^(-x^2) comes from?

Adding random variables, with connections to the central limit theorem.

Original Title: The absurd circle division pattern explained | Moser's circle problem An apparent pattern that breaks, and the reason behind it.

Original Title: So why is the "central limit" a normal distribution? A visual trick to compute the sum of two normally-distributed variables.

Shining polarized light into sugar water reveals diagonal stripes of color. Why?

Explaining the barber pole effect from the last video.

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How the index of refraction arises, and why it depends on color.

Answering viewer questions about the index of refraction