Photo Caption: This fully functioning Japanese abacus is actually an interactive image on a smart phone. The number shown is 5,236. Screen image by Forrest M. Mims III. A year after the U.S. soundly ...
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I replaced Adobe Acrobat with this open-source PDF reader, and it’s faster than I expected
Switching away from Adobe Acrobat wasn't something I planned, it was a necessity. After years of using it, I felt every update piled on more features, making the software feel heavier and slower. I ...
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