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2. Napkin folding problem - Wikipedia

   en.wikipedia.org/wiki/Napkin_folding_problem

   The napkin folding problem is a problem in geometry and the mathematics of paper folding that explores whether folding a square or a rectangular napkin can increase its perimeter. The problem is known under several names, including the Margulis napkin problem, suggesting it is due to Grigory Margulis, and the Arnold's rouble problem referring ...

3. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   The 19-inch (482.6 mm) standard rack arrangement is widely used throughout the telecommunications, computing, audio, video, entertainment and other industries, though the Western Electric 23-inch standard, with holes on 1-inch (25.4 mm) centers, is still used in legacy ILEC / CLEC facilities. Nineteen-inch racks in two-post or four-post form ...

4. Mathematics of paper folding - Wikipedia

   en.wikipedia.org/wiki/Mathematics_of_paper_folding

   In 1999, a theorem due to Haga provided constructions used to divide the side of a square into rational fractions. [ 19 ] [ 20 ] In late 2001 and early 2002, Britney Gallivan proved the minimum length of paper necessary to fold it in half a certain number of times and folded a 4,000-foot-long (1,200 m) piece of toilet paper twelve times.

5. Wayfair's 4th of July sale includes major markdowns on patio ...

   www.aol.com/lifestyle/wayfairs-4th-of-july-sale...

   Red Barrel Studio Kantzer Folding Zero-Gravity Chair, Set of 2. $90 $100. Save $10. ... Wfx Utility Aleg 36-Inch Garage Storage Cabinet. $190 $363. ... Dress up your dining table, fireplace mantle ...

6. Metre-stick - Wikipedia

   en.wikipedia.org/wiki/Metre-stick

   The folding carpenters' rulers used in Scandinavia are sometimes equipped with double measurements, metric and imperial on both sides, also functioning as a handy conversion table, accounting for its Scandinavian term: Tommestokk/tumstock (thumb (inch) stick), [4] a term with the same meaning that is also used in Dutch: duimstok. Metric only ...

7. Hoberman sphere - Wikipedia

   en.wikipedia.org/wiki/Hoberman_sphere

   A Hoberman sphere is a kinetic structure patented by Chuck Hoberman that resembles a geodesic dome, but is capable of folding down to a fraction of its normal size by the scissor-like action of its joints. Colorful plastic versions have become popular as children's toys: several toy sizes exist, with the original design capable of expanding ...