- Brooklyn (Wikipedia)
Brooklyn is a borough of New York City located at the westernmost end of Long Island in the State of New York. Formerly an independent city, the borough is coextensive with Kings County, one of twelve original counties established under British rule in 1683 in the then Province of New York. As of the 2020 United States census, the population stood at 2,736,074, making it the most populous of the five boroughs of New York City, the most populous county in the State of New York, and the ninth most populous county in the United States. In 2022, the population density of Brooklyn was recorded at 37,339.9 inhabitants per square mile (14,417.0/km2), making it the second most densely populated county nationwide, behind only Manhattan (New York County). Had Brooklyn remained an independent city, it would today be the fourth most populous American city after New York, Los Angeles, and Chicago.
- Double-slit experiment (Wikipedia)
In modern physics, the double-slit experiment demonstrates that light and matter can satisfy the seemingly incongruous classical definitions for both waves and particles. This ambiguity is considered evidence for the fundamentally probabilistic nature of quantum mechanics. This type of experiment was first performed by Thomas Young in 1801, as a demonstration of the wave behavior of visible light. In 1927, Davisson and Germer and, independently George Paget Thomson and his research student Alexander Reid demonstrated that electrons show the same behavior, which was later extended to atoms and molecules. Thomas Young’s experiment with light was part of classical physics long before the development of quantum mechanics and the concept of wave–particle duality. He believed it demonstrated that Christiaan Huygens’ wave theory of light was correct, and his experiment is sometimes referred to as Young’s experiment or Young’s slits.