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[7] [8] [9] This time range is a hot source of debate. The few agreements achieved to date are the origin from Central Asia , with widespread habitation of the Americas during the end of the last glacial period , or more specifically what is known as the late glacial maximum , around 16,000 – 13,000 years before present.
The discovery of a hematite artifact has led many experts to believe that Olmec invented the compass 1,000 years before the Chinese did, although some still are not convinced. [ 22 ] Compulsory education – the Aztec Triple Alliance, which ruled from 1428 to 1521 CE, is considered to be the first state to implement a system of universal ...
This timeline of time measurement inventions is a chronological list of particularly important or significant technological inventions relating to timekeeping devices and their inventors, where known. Note: Dates for inventions are often controversial. Sometimes inventions are invented by several inventors around the same time, or may be ...
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.
This invention -- Eli Whitney received a patent for his cotton gin on March 14, 1794. For the first time, American plantation owners would be able to harvest large amounts of cotton profitably.
A tattoo machine is a hand-held device generally used to create a tattoo, a permanent marking of the skin with ink. The basic machine, which was called Stencil-Pens, was invented by Thomas Alva Edison and patented in the United States in 1876.
1774: John Wilkinson invents his boring machine, considered by some to be the first machine tool. 1775: Jesse Ramsden invents the modern screw-cutting lathe. 1776: John Wilkinson invents a mechanical air compressor that would become the prototype for all later mechanical compressors. 1778: Robert Barron invents the first lever tumbler lock.
In the early decades of its history, the United States was relatively isolated from Europe and also rather poor. At this stage, America's scientific infrastructure was still quite primitive compared to the long-established societies, institutes, and universities in Europe. Eight of America's founding fathers were scientists of some repute.