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Genetic evidence from body lice suggests a range of dates centering over 100 thousand years ago. [28] The first bone scrapers appropriate for scraping hides to make supple leather were found in Morocco dating to 90–120,000 years ago. [29] [30] 164 kya – 47 kya: Heat treating of stone blades in South Africa. [31]
100: Menelaus of Alexandria describes spherical triangles, a precursor to non-Euclidean geometry. [69] 150: The Almagest of Ptolemy contains evidence of the Hellenistic zero. Unlike the earlier Babylonian zero, the Hellenistic zero could be used alone, or at the end of a number.
At 78 RPM mechanically scanned, the images can be played back on his "telescreen". It could not play sound nor keep up with the rapidly increasing resolution of television. More than 40 years later, commercial optical disc players came onto the market. 1928: Fritz Pfleumer got the first tape recorder patent.
From the first Apple computer to the COVID-19 vaccine, here are the most revolutionary inventions that were born in the U.S.A. in the past half-century.
The Patent Act of 1836 (Ch. 357, 5 Stat. 117) further clarified United States patent law to the extent of establishing a patent office where patent applications are filed, processed, and granted, contingent upon the language and scope of the claimant's invention, for a patent term of 14 years with an extension of up to an additional seven years.
The invention builds on acetylene lamps from the 1890s. 1901 Peter Cooper Hewitt creates the first commercial mercury-vapor lamp. 1904 Alexander Just and Franjo Hanaman invent the tungsten filament for incandescent lightbulbs. 1910 Georges Claude demonstrates neon lighting at the Paris Motor Show. 1912 Charles P. Steinmetz invents the metal ...
Engineers during World War Two test a model of a Halifax bomber in a wind tunnel, an invention that dates back to 1871. The following is a list and timeline of innovations as well as inventions and discoveries that involved British people or the United Kingdom including predecessor states in the history of the formation of the United Kingdom ...
Leland Grove businessman George W. Preckwinkle, who has been on the Sangamon County Board since 2007, has resigned effective immediately.. Board Chairman Andy Van Meter informed other members in ...