How a Zipper Works
Illustrating Pi: Unrolling a Circle’s Circumference
How a Pill Press Works
How Walschaerts Valve Gear in Steam Locomotives Works
What a Tesseract (4D Cube) Looks Like
Knight’s Tour: How a Knight Visits Every Square Once
How a Caliper Works
How a Constant Velocity Joint Works
How Circle Strafing Works
Proving the Pythagorean Theorem Through Rearrangement
How a Radial Engine Works
How the Geneva Drive Works
How the Spinning Dancer Illusion Works
How a Hypotrochoid is Made
How an Alpha Stirling Engine Works
How to Draw a Yin Yang Symbol Using Circles
How a Wankel Engine Works
How a Sewing Machine Works
How the Sun and Planet Gear Works
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BTW, #13 I can make her spin in both directions but there is no explanation on how it works... Somewhat misleading then.