Home›Categories›Open QuestionsCategoriesOpen QuestionsCitation FormatsGeneral ReferenceGeneral Reference Citation TextTechnology and Engineering Atlas. "Open Questions." Accessed August 30, 2026. https://technology.interactiveatlas.org/categories/open-questions-index.Copy General ReferenceAPA StyleAPA Style Citation TextTechnology and Engineering Atlas. (n.d.). Open Questions. Retrieved August 30, 2026, from https://technology.interactiveatlas.org/categories/open-questions-indexCopy APA StyleBibTeXBibTeX Citation Text@misc{technologyandengineeringatlas-open-questions, author = {Technology and Engineering Atlas}, title = {Open Questions}, year = {2026}, url = {https://technology.interactiveatlas.org/categories/open-questions-index}, note = {Accessed August 30, 2026} }Copy BibTeXReference and ClassificationDevelopingCross-Tradition ConnectionsComments (0)Reader Challenges (0 open reader challenges)Cross-Tradition ConnectionsContainsDid Guglielmo Marconi know of Alexander Popov's 7 May 1895 coherer receiver demonstration before filing his own 1896 patent application, or did the two men arrive at similar designs independently from the same published coherer research?, Open Questions Well-attested Did Knowledge of Chinese and Korean Movable Type Reach Johannes Gutenberg Before His Independent Invention?, Open Questions Well-attested Does priority for isolating metallic aluminum belong to Hans Christian Orsted, whose 1825 sample was first but impure and never fully confirmed, or to Friedrich Wohler, whose 1827 sample was purer and better documented?, Open Questions Well-attested Does priority for vulcanization belong to Charles Goodyear, who discovered the sulfur-and-heat process in 1839, or Thomas Hancock, who filed the first patent on it, in Britain, in 1843?, Open Questions Well-attested Does Su Song's 1092 water-driven astronomical clock tower count as the first mechanical clock, or does that title belong to the weight-driven verge-escapement clocks first attested in Europe in the 1280s?, Open Questions Well-attested Should sintering's origin be dated to its ancient craft use in fired ceramics and early sintered-metal artifacts, or to William Coolidge's 1909 patented process, the point it became a deliberately engineered industrial technique?, Open Questions Well-attested Was Garrett AiResearch's classified Central Air Data Computer chip set (1968-1970), Texas Instruments' 1971 single-chip CPU patent, or Intel's commercially released 4004 (1971) the first true microprocessor?, Open Questions Well-attested When did the Chinese magnetic compass move from a tool of divination and orientation to genuine sea navigation, and did the practice reach medieval Europe by transmission along existing trade routes or arise there independently?, Open Questions Well-attested Who Invented the Wheel, Open Questions Well-attested Who should be credited as radar's inventor: Christian Hulsmeyer's 1904 patent, Robert Watson-Watt's 1935 Daventry Experiment, or one of the other near-simultaneous 1930s national radar programs in Germany, France, the United States or the Soviet Union?, Open Questions Well-attested Comments (0)No comments yet. Be the first to share a thought.Sign in to join the discussion.Reader Challenges (0 open reader challenges)No disputes yet. Spotted an error or a better source? Open the first one.Sign in to dispute this or suggest a correction.View At A Past YearThe atlas records no dated fact of its own for this entry, so there is no other year to choose.Show This Year