Search results
Results from the WOW.Com Content Network
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]
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.
Two years later, his patent ran out. 1886: Heinrich Hertz succeeds in proving the existence of electromagnetic waves for the first time – now the groundwork for wireless telegraphy and radio broadcasting in physical science is laid. 1887: Unaware of Charles Sumner Tainter's experiments, German-American Emil Berliner has his phonograph ...
However, when 2,000 years ago, during the Three Kingdoms period, the Chinese inventor Ma Jun created a chariot with a built-in compass for Emperor Ming-di, it was a real wonder.
Year of discovery Name of the drug Year when the synthesis mechanism was developed Year that was Patented Governmental approval Patented expired 1901: Adrenaline: Jōkichi Takamine, 1901: 1901: 1901: N/A (Natural Hormone) 1906: Oxytocin: Discovered by Henry Hallett Dale, synthesized by Vincent du Vigneaud in 1952: 1925: 1926: N/A (Natural ...
These timelines of world history detail recorded events since the creation of writing roughly 5000 years ago to the present day. For events from c. 3200 BC – c. 500 see: Timeline of ancient history; For events from c. 500 – c. 1499, see: Timeline of post-classical history; For events from c. 1500, see: Timelines of modern history
The earliest methods of stone tool making, known as the Oldowan "industry", date back to at least 2.3 million years ago. [7] This era of stone tool use is called the Paleolithic , or "Old stone age", and spans all of human history up to the development of agriculture approximately 12,000 years ago.
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.