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  2. Category:20th-century inventions - Wikipedia

    en.wikipedia.org/wiki/Category:20th-century...

    20th-century percussion instruments (21 P) Pages in category "20th-century inventions" The following 128 pages are in this category, out of 128 total.

  3. Timeline of historic inventions - Wikipedia

    en.wikipedia.org/.../Timeline_of_historic_inventions

    The timeline of historic inventions is a chronological list of particularly important or significant technological inventions and their ... 20th century. 1900s

  4. 20th century in science - Wikipedia

    en.wikipedia.org/wiki/20th_century_in_science

    The 20th century saw mathematics become a major profession. As in most areas of study, the explosion of knowledge in the scientific age has led to specialization: by the end of the century there were hundreds of specialized areas in mathematics and the Mathematics Subject Classification was dozens of pages long. [72]

  5. Timeline of fundamental physics discoveries - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_fundamental...

    7 20th century. 8 21st century. 9 See also. 10 References. Toggle the table of contents. ... 1948 – Invention of the maser and laser by Charles Townes; 1948 ...

  6. Second Industrial Revolution - Wikipedia

    en.wikipedia.org/wiki/Second_Industrial_Revolution

    Electrification was called "the most important engineering achievement of the 20th century" by the National Academy of Engineering. [30] Electric lighting in factories greatly improved working conditions, eliminating the heat and pollution caused by gas lighting, and reducing the fire hazard to the extent that the cost of electricity for ...

  7. The Greatest American Inventions of the Past 50+ Years - AOL

    www.aol.com/greatest-american-inventions-past-50...

    The past half-century has produced some of the most significant and astounding inventions ever developed in human history, and many notable ones came to life in the United States.

  8. Timeline of United States inventions (1890–1945) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    The electric flash-lamp is a device that uses an electrical circuit to trigger a fuse to ignite explosive powder such as magnesium, for a brief sudden burst of bright light "flash" from a chemical reaction of flash powder burning. It was principally used for flash photography in the early 20th century, but had other uses as well.

  9. Timeline of electrical and electronic engineering - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_electrical_and...

    20th Century Fox presents in New York on an 8 m × 4 m big screen the first widescreen movie. The radio station Witzleben begins in Germany with the regular broadcasting of television test broadcasts, initially on long wave with 30 lines (= 1,200 pixels) at 12.5 image changes per second. It appear first blueprints for television receiver.