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Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in its natural form as a crystalline mineral is known as rock salt or halite. Salt is present in vast quantities in seawater, where it is the main mineral constituent. The open ocean has about 35 grams (1.2 oz) of solids per liter of sea water, a salinity of 3.5%.
Salt is essential for life in general, and saltiness is one of the basic human tastes. Salt is one of the oldest and most ubiquitous food seasonings, and salting is an important method of food preservation.
Some of the earliest evidence of salt processing dates to around 6,000 BC, when people living in the area of present-day Romania boiled spring water to extract salts; a salt-works in China dates to approximately the same period. Salt was also prized by the ancient Hebrews, the Greeks, the Romans, the Byzantines, the Hittites, Egyptians, and the Indians. Salt became an important article of trade and was transported by boat across the Mediterranean Sea, along specially built salt roads, and across the Sahara on camel caravans. The scarcity and universal need for salt have led nations to go to war over it and use it to raise tax revenues. Salt is used in religious ceremonies and has other cultural and traditional significance.
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Fiorello Henry La Guardia (; born Fiorello Raffaele Enrico La Guardia, Italian pronunciation: [fjoˈrɛllo raf.faˈɛ.le enˈriːko la ˈɡwardja]; December 11, 1882 – September 20, 1947) was an American attorney and politician who represented New York in the House of Representatives and served as the 99th Mayor of New York City from 1934 to 1946. He was known for his irascible, energetic, and charismatic personality and diminutive, rotund stature. A socialist member of the Republican Party, La Guardia was frequently cross-endorsed by parties other than his own, especially parties on the left under New York's electoral fusion laws. A panel of 69 scholars in 1993 ranked him first among the ten best mayors in American history.
He was born to Italian immigrants in New York City. Before serving as mayor, La Guardia represented Manhattan in Congress and on the New York City Board of Aldermen. As mayor, during the Great Depression and World War II, La Guardia unified the city's transit system; expanded construction of public housing, playgrounds, parks, and airports; reorganized the New York Police Department; and implemented federal New Deal programs within the city.