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Diameter? Do you perhaps mean circumference?
From the clip: "This bet is based on geometry, and even Paul can make a mistake in his calculations."
Ehm, I didn`t see any calculations? If anything it`d be more accurate to say estimation, as he did not calculate any numbers using geometry.
In fact, I doubt this had much of anything to do with geometry, as a cylinder`s circumference is not necessarily always a greater distance in units than the heighth of the cylinder and vice versa, which is the point they seemed to want to make. If anything, this trick was based solely off an optical illusion.
do you really really want to know how?
how about u take one when no one is looking?
Sorry, drugs on the brain.
He would sit so that there was a window or some light in front of him so he could see the colors on the bubble. The color changes as the bubble thins so he could accurately predict when they would pop.