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Did you ever worry that your socks might be ghosts? In this authoritative video, I share 5 reasons socks CANNOT be ghosts, because you deserve the truth.

Look, I just was trying to quickly throw some old footage together and then this happened by accident, really. The footage is actually of two different snails, back when I was running Vi Hart's Home for Handicapable Snails...

Yeah, amusing myself. Polyhedral googly goodness, fractal googly eyes...

Credit to Minli, my Khan Academy partner-in-crime, for the cube pun!

The cool stuff in my office, before we move! Special thanks to my partner in crime, Minli.

youtube.com/khanacademy

http://www.khanacademy.org

One year later... never-before-seen footage of the most epic battle known to man.

Hourglass Race part 1: http://youtu.be/zytCrpmKiVc

Slowing down to explain a couple things in Angle-a-Trons: http://youtu.be/o6W6P8JZW0o

Which slows down to explain a couple things in Being a Plant part 2: http://youtu.be/lOIP_Z_-0Hs

Which of course comes after Being a Pla...

Postscript to this letter: http://youtu.be/gBxeju8dMho

More Snail: http://youtu.be/xbsAUq_nvxE

Sidenote from Doodling Spirals, Fibonacci, and Being a Plant: http://www.youtube.com/watc...

Notes and References page: http://youtu.be/POKWkuwoihM

"The Mathematical Lives of Plants," by Julie Rehmeyer: http://www.sciencenews.org/...

The Book of Numbers, by Conway and Guy http://books.google.com/books...

Quick explanation of how I got "the Lucas angle is about 100 degrees" in this video: http://youtu.be/14-NdQwKz9w

Related: Doodling Stars http://youtu.be/CfJzrmS9UfY

CRAZY PET HIJINKS! It's like a youtube video! I warned you.

More Crazy Snail: http://youtu.be/UkSN-kqAmxw