Physicists in Germany have carried out the most accurate measurement to date of the width of the proton. By examining a previously unexplored energy-level transition in the hydrogen atom, Lothar ...
The Xtape1 is a very different take on the laser tape measure. This one has a laser, yes (three, actually, a red one is used for measuring, and two green aligning beams) that's good out to 330 feet ...
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