Răspuns :
Răspuns:
POST-IT NOTES
Explicație:
In 1968, a 3M chemist named Dr. Spencer Silver was attempting to create a super-strong adhesive when instead he accidentally invented a super-weak adhesive, which could be used to only temporarily stick things together. The seemingly limited application of Silver’s product meant that it sat unused at 3M (then technically known as Minnesota Mining & Manufacturing) for another five years, until, in 1973, a colleague named Art Fry attended one of Silver’s seminars and struck upon the idea that his impermanent glue could be used to stick bookmarks into the pages of his hymnbook. It took another few years for 3M to be convinced both of Fry and Silver’s idea and of the salability of their product, but eventually they came up with a unique design that worked perfectly: a thin film of Spencer’s adhesive was applied along just one edge of a piece of paper. After a failed test-market push in 1977 as Press ’N Peel, the product went national as the Post-It note in 1980.
Thomas Alva Edison was an important American inventor and businessman of the late nineteenth and early twentieth centuries. He was also known as the "Magician of Menlo Park", being the most prolific inventor of the time by the practical application of scientific discoveries (1093 patents). He was a self-taught man, but this did not stop him from making inventions in the field of electricity (filament bulb), telephony, multiple telegram transmission system, mechanical sound recording (phonograph) and cinematography - the kinetoscope.
He was born in 1847.
His well-known invention is the incandescent bulb. This invention was made in 1879.
Edison noticed the thermal effect of the electric current and thought that a conductor could be heated to incandescence, at which point it became a light source.
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