Have you ever been cleaning out an old drawer, or perhaps browsing through a box of curios at an estate sale, when your hand closes around a small, sealed glass tube? You hold it up to the light and see two or three tiny metal ball bearings resting at the bottom. When you tilt it, they roll and strike each other with a sharp, satisfying, rhythmic clack-clack-clack.
If you’ve found one of these mysterious little tubes, you might have found yourself asking: What on earth is this? Is it a
piece of scientific
equipment? A fragment of an old medicine
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