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Dmitri Mendeleev Source: Dmitri Ivanovich Mendeleev[a][b] ( MEN-dəl-AY-əf;[2] 8 February [O.S. 27 January] 1834 – 2 February [O.S. 20 January] 1907) was a Russian chemist known for formulating the periodic

1976 Tehran UFO incident Source: On 19 September 1976, a radar and visual sighting of an unidentified flying object (UFO) occurred over Tehran, the capital of Iran, by civilians and military personnel.

Navier–Stokes equations Source: The Navier–Stokes equations mathematically express momentum balance for Newtonian fluids and make use of the conservation of mass. They are sometimes accompanied by an equation