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A major piece of evidence for the presence of dark matter in the Universe, discovered by Vera Rubin from observations of galactic rotation curves in the 1970s. Stars luminosity Henrietta Swan Leavitt was an American astronomer who discovered the relation between the luminosity and the period of Cepheid variable stars at the beginning of 20th ...
In the US, in 1954, only 1.5% of patents named a woman, compared with 10.9% in 2002. [1] Women's inventions have historically been concentrated in some areas, such as chemistry and education, and rare in others, such as physics, and electrical and mechanical engineering. [1]
The concept of automated data processing had been born. In 1890, Herman Hollerith invented the mechanical tabulating machine, a design used during the 1890 Census which stored and processed demographic and statistical information on punched cards. [14] [15] 1890 Shredded wheat. Shredded wheat is a type of breakfast cereal made from whole wheat.
1890: Austrian-born chemist Ida Freund became the first woman to work as a university chemistry lecturer in the United Kingdom. She was promoted to full lecturer at Newnham College, Cambridge. [110] 1890: Popular science educator and author Agnes Giberne co-founded the British Astronomical Association. [111]
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 ...
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.
Mar. 2—It may seem like a recent trend for more women to be entering STEM fields, but women have a long history of contributing to innovations in science, technology, engineering and mathematics.
The following articles cover the timeline of United States inventions: Timeline of United States inventions (before 1890), before the turn of the century; Timeline of United States inventions (1890–1945), before World War II; Timeline of United States inventions (1946–1991), during the Cold War