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The presence of glucose in urine could be measured by adding a few drops of urine to a Clintest tablet in a test tube and charting differences in color. Clinitest more accurately measured the amount ...

As the water melts the wax, the foam acts as a buoy to keep the capsule afloat. Once the wax has melted, the user nestles a 3D-printed plastic test tube holder into the top opening.

Inside a test tube, literally trillions of possible solutions can be generated in parallel. The problems that can be solved, however, need to be rigidly specified.