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However, blind experiments have never conclusively found a difference between the sound of Stradivari's violins and other high-quality violins. [8] Starlite is an intumescent material said to withstand enormous amounts of heat. [6] Zhang's seismoscope, also known as hòufēng dìdòngyí, an ancient Chinese seismometer.
Technologies that were never successfully developed, may have disappeared completely. [2] These are not contained in the following list. Also not included are spurious inventions - technologies which are generally considered to not possess their claimed capabilities, to be hoaxes, or to not have ever existed in the first place.
Image credits: Nationaal Archief #11 Revolving Book Case, From Page 202 Of History And Description Of The Crystal Palace And The Exhibition Of The World's Industry In 1851
An ancient Chinese mechanical compass which took a millennium to reproduce. Tall bike: A bike which consists of two conventional bicycle frames connected one atop the other. Train surfing: As respectable and practical as drying one's hair in most parts of the world. Unused highway: Lost highways, unloved and unused. Uruguayan Air Force Flight 571
5. Play-Doh. Who: Kay Zufall, Brian, Joseph McVicker, Bill Rhodenbaugh When: 1956 . How it was created: The gooey toy kids have been playing with for decades began as a household cleaning product ...
But not all inventions are major wins like cellphones, stoplights, or washing machines. Many more are in the category of absurd inventions that fell short of success. 13 Weird Inventions That Were ...
1380: Madhava of Sangamagrama discovers the most precise estimate of π in the medieval world through his infinite series, a strict inequality with uncertainty 3e-13. 15th century: Parameshvara discovers a formula for the circumradius of a quadrilateral. [114] 1480: Madhava of Sangamagrama found pi and that it was infinite.
Image credits: anon #9. 2 Things. Completed products. Before the rise of online gaming all games had to be completed before they could be pushed out and you couldn't really do upgrades (although ...