Euler's Disk
Euler's disk is a toy some guy "invented" that is exactly the same as spinning a quarter on a table top. He just used better materials and marketed it. Behind the scenes of this toy, there is an insane amount of study involved.[1]
Physicists are fucking retarded.[2]
IGx, IGy, and IGz are the principal moments of inertia of the disk about point G about the local x, y, and z directions (respectively)...Jesus Christ, nobody gives a shit about all this. It's a fucking coin.[3] 
References
Leidenfrost Effect | Euler's Disk | Fencing Response | Garry Hoy | Roko's Basilisk | The Madness of Mission Six | Best Bond Girl Names
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