Comments by "John Berry" (@user-ud6ui7zt3r) on "Best of The History Guy: Invention" video.

  1. You could have mentioned cellophane. Clear cellophane is often used to decoratively wrap fudge and candy. It is often used in high school biology classes, to demonstrate both diffusion and dialysis. You see, if you have a bag that is made out of clear cellophane, and you fill the bag with water, the exterior surface of the bag will produce a film of water, because the water inside the bag leaks out through natural microscopic holes present in the cellophane membrane.
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