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The base unit of time in the International System of Units (SI) and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom. The exact modern definition, from the National Institute of Standards and Technology is: "The second, symbol s, is the SI unit of time.
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Optics and Gravity i know i got this one right
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What did Alexios komnenos do?
Alexius I Comnenus, also spelled Alexios I Komnenos, (born 1057, Constantinople, Byzantine Empire [now Istanbul, Turkey]—died August 15, 1118), Byzantine emperor (1081–1118) at the time of the First Crusade who founded the Comnenian dynasty and partially restored the strength of the empire after its defeats.
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