a dime. Have your kids count the ridges—or better yet, run a pencil rubbing over the edges onto white craft paper. A standard United States quarter has exactly 119 reeded
ridges around its perimeter, while a regular dime contains 118. It is an astonishing bit of microscopic engineering hiding on something that usually gets forgotten under car seats.
The Enduring Genius in Your Pocket
Our day-to-day lives are filled with clever little historical artifacts that survive simply because they work. We tap plastic cards and wave smartwatch screens, yet the
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