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Petzval was not aware of the scale of his invention at the start of his work on the lens, and later regretted not having secured his rights by obtaining letters patent on his invention. It was the first lens to be designed using mathematical computation, and a team of mathematicians whose specialty was in fact calculating the trajectories of ...
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 ...
The term artificial objects is closely associated with made by humans or not naturally occurring items that have been sent into space. This is a list of lists of artificial objects in space found on Wikipedia. Category:Lists of artificial objects sent into space; Category:Lists of space missions; Lists of spacecraft. Category:Lists of spacecraft
One branch of amateur astronomy, astrophotography, involves the taking of photos of the night sky. Many amateurs like to specialize in the observation of particular objects, types of objects, or types of events that interest them. [120] [121] Most amateurs work at visible wavelengths, but many experiment with wavelengths outside the visible ...
The Lower Paleolithic period lasted over 3 million years, during which there many human-like species evolved including toward the end of this period, Homo sapiens.The original divergence between humans and chimpanzees occurred 13 (), however interbreeding continued until as recently as 4 Ma, with the first species clearly belonging to the human (and not chimpanzee) lineage being ...
The all-over plastic bathing suit, to enable people who suffer from aquaphobia to swim without coming into contact with water. The baby mop, an outfit worn by babies, so that as they crawl around, the floor is cleaned. [2] The selfie stick. While dismissed as a "useless invention" at the time, it later gained global popularity in the 21st ...
The breathalyzer test, called Freedom by ViraWarn, was recently involved in a month-long study at George Mason University and was shown to be 100% accurate, providing results in just five seconds.
The camera obscura was used to study eclipses without the risk of damaging the eyes by looking directly into the Sun. As a drawing aid, it allowed tracing the projected image to produce a highly accurate representation, and was especially appreciated as an easy way to achieve proper graphical perspective .