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2. Step stool - Wikipedia

   en.wikipedia.org/wiki/Step_stool

   Step stool with 2 steps. Step stools are halfway between a ladder and a stool, being used, as a support platform, for reaching targets that are at heights between approximately 2 and 3 metres (6.6 and 9.8 ft). The most common modern type is made with two separate ladders connected to each other at the upper end, where there is a platform with ...

3. Step chair - Wikipedia

   en.wikipedia.org/wiki/Step_chair

   A step chair, also called a ladder chair, a library chair, a convertible chair or a Franklin chair, is a piece of furniture which folds to become either a chair or a small set of steps or stairs. Building one (usually in the diagonal-side-cut style) is a popular DIY project.

4. John H. Balsley - Wikipedia

   en.wikipedia.org/wiki/John_H._Balsley

   John H. Balsley (May 29, 1823 – March 12, 1895) was a master carpenter and inventor, inventing a practical folding wooden stepladder and receiving the first U.S. patent issued for a safety stepladder in the year. He was born in Connellsville, Fayette County, Pennsylvania to George H. and Sarah (Shallenberger) Balsley. His father was also a ...

5. These Folding Treadmills Take Up Little Space and Help You ...

   www.aol.com/folding-treadmills-little-space-help...

   Under Desk Treadmill. With a speed range of 0.5-7.5 miles per hour, this walking pad with a foldable bar is great for those looking to power walk in a small space.

6. X-chair - Wikipedia

   en.wikipedia.org/wiki/X-chair

   A type of folding chair with a frame like an X viewed from the front or the side originated in medieval Italy. Also known as a Savonarola or Dante chair in Italy , [ 1 ] or a Luther chair in Germany , the X-chair was a light and practical form that spread through Renaissance Europe .

7. 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 ...