Happy Sandpaper Day! Sandpaper was patented on 14 June 1834. I thought about creating a necktie from sandpaper, but Beth and I agreed it would be too rough. (That's a fine attempt at some coarse humor.) So instead I'm following my annual tradition of honoring the birthday of French physicist Charles-Augustin de Coulomb (1736-1806). Coulomb explored how electrical energy could be stored between metal plates separated by an insulator (such as paper or air). The standard unit of electrical charge is named in his honor. On my tie, the dots between the solid stripes represent the electric field between charged plates.
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