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2. Mathematics of paper folding - Wikipedia

   en.wikipedia.org/wiki/Mathematics_of_paper_folding

   The distances L and t must be expressed in the same units, such as inches. This result was derived by Britney Gallivan, a high schooler from California , in December 2001. In January 2002, she folded a 4,000-foot-long (1,200 m) piece of toilet paper twelve times in the same direction, debunking a long-standing myth that paper cannot be folded ...

3. Infinite compositions of analytic functions - Wikipedia

   en.wikipedia.org/wiki/Infinite_compositions_of...

   ICAFs can be constructed to describe continuous motion of a point, z, over the interval, but in such a way that at each "instant" the motion is virtually zero (see Zeno's Arrow): For the interval divided into n equal subintervals, 1 ≤ k ≤ n set , = +, analytic or simply continuous – in a domain S, such that

4. 4 ft 6 in gauge railway - Wikipedia

   en.wikipedia.org/wiki/4_ft_6_in_gauge_railway

   The 4 ft 6 in (1,372 mm) track gauge, also called the Scotch gauge, was adopted by early 19th century railways mainly in the Lanarkshire area of Scotland. It differed from the gauge of 4 ft 8 in ( 1,422 mm ) that was used on some early lines in England .

5. Supersonic speed - Wikipedia

   en.wikipedia.org/wiki/Supersonic_speed

   During ascent, launch vehicles generally avoid going supersonic below 30 km (~98,400 feet) to reduce air drag. Note that the speed of sound decreases somewhat with altitude, due to lower temperatures found there (typically up to 25 km). At even higher altitudes the temperature starts increasing, with the corresponding increase in the speed of ...