The Engineering of a Disposable Diaper

YouTube description:

Bill reveals the stunning engineering underlying the design of a diaper. He describes the five layers of a diaper, including the superabsorbent polymer in the diaper's core. He illustrates the action of this polymer with a stunning demonstration using a single bead of polymer: it soaks up enough water to grow from a diameter of 4 mm to nearly a half inch.

You can bundle watch Bill's videos using this playlist:
If you are interested in mechanical computers you'll likely enjoy his series on Albert Michelson's Harmonic Analyzer -- a 19th century machine that calculates Fourier transforms:

Creative Commons Images Used in Video
First cotton image is by dotlizard

The cotton candy image is from Stefano Mortellaro

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