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

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

    Ruth Wakefield of Whitman, Massachusetts, invented chocolate chips and chocolate chip cookies in 1930. Her new cookie invention was called the "Toll House Cookie" which used broken-up bars of semi-sweet chocolate. [236] 1930 Thermistor. A thermistor is a type of resistor with electrical resistance inversely proportional to its temperature.

  3. Timeline of electrical and electronic engineering - Wikipedia

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

    It was not until 1930, he is called a " telescreen sold "at a price of 20 pounds. 1927 The first fully electronic music boxes ("Jukeboxes") used in the USA on the market. German Grammophon on sale due to a license agreement with the Brunswick-Balke-Collender Company. Its first fully electronic turntables.

  4. Timeline of United States inventions - Wikipedia

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

    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

  5. Timeline of historic inventions - Wikipedia

    en.wikipedia.org/.../Timeline_of_historic_inventions

    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 ...

  6. Timeline of scientific discoveries - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_scientific...

    1930: Subrahmanyan Chandrasekhar discovers his eponymous limit of the maximum mass of a white dwarf star; 1931: Kurt Gödel: incompleteness theorems prove formal axiomatic systems are incomplete; 1932: James Chadwick: Discovery of the neutron; 1932: Karl Guthe Jansky discovers the first astronomical radio source, Sagittarius A

  7. List of German inventions and discoveries - Wikipedia

    en.wikipedia.org/wiki/List_of_German_inventions...

    1900: Drude model by Paul Drude [449] 1900: Planck constant and Planck's law by Max Planck [450] 19001930: Quantum mechanics by i.a. Max Planck and Werner Heisenberg [451] 1901: Modern pyrometer by Ludwig Holborn and Ferdinand Kurlbaum [452] 1904: Boundary layer theory by Ludwig Prandtl [453] 1904: First radar system by Christian Hülsmeyer ...

  8. 20th century in science - Wikipedia

    en.wikipedia.org/wiki/20th_century_in_science

    In a 1900 speech to the International Congress of Mathematicians, David Hilbert set out a list of 23 unsolved problems in mathematics. These problems, spanning many areas of mathematics, formed a central focus for much of 20th-century mathematics. Today, 10 have been solved, 7 are partially solved, and 2 are still open.

  9. Florence Parpart - Wikipedia

    en.wikipedia.org/wiki/Florence_Parpart

    The first invention credited to Parpart is a street sweeper designed to automate the process of cleaning city streets. Parpart filed two patents for this invention (No. 649,609 [32] in 1899 and no. 762,241 [33] in 1901), both of which listed Hiram D. Layman as co-inventor despite his being only an investor.