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Reading stone in Archeon, a historical theme park. A reading stone is an approximately hemispherical lens that can be placed on top of text to magnify the letters so that people with presbyopia can read it more easily. Reading stones were among the earliest common uses of lenses.
The Ninja Creami tends to sell out when it goes on sale. It's no longer on sale on Amazon, but at Walmart, it's still on sale — and only $149. You can whip up pints of ice cream with just a few ...
The magnifying power obtained in this condition is MP 0 = (0.25 m)Φ + 1, where Φ is the optical power in dioptres, and the factor of 0.25 m represents the assumed near point (¼ m from the eye). This value of the magnifying power is the one normally used to characterize magnifiers.
The Microsoft Windows operating system has included the "Magnifier" application since Windows 98 (released in 1998). It can integrate with a mouse-button toggle. [4] In OS X, the built-in screen magnification feature can be used at any time by using keyboard shortcuts or by scrolling with a mouse or trackpad.
If you can read cursive, the National Archives would like a word. Or a few million. More than 200 years worth of U.S. documents need transcribing (or at least classifying) and the vast majority ...