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At its peak at the end of the 19th century, the U.S. ice trade employed an estimated 90,000 people in an industry capitalised at $28 million ($660 million in 2010 terms), using ice houses capable of storing up to 250,000 tons (220 million kg) each; Norway exported a million tons (910 million kg) of ice a year, drawing on a network of artificial ...
John Brown (May 9, 1800 – December 2, 1859) was a prominent leader in the American abolitionist movement in the decades preceding the Civil War.First reaching national prominence in the 1850s for his radical abolitionism and fighting in Bleeding Kansas, Brown was captured, tried, and executed by the Commonwealth of Virginia for a raid and incitement of a slave rebellion at Harpers Ferry in 1859.
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A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code. The specific service access varies by country.
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite because it is a ...
A check or check mark ( American English ), checkmark ( Philippine English ), tickmark ( Indian English) or tick ( Australian, New Zealand and British English) is a mark ( , , etc.) used, primarily in the English-speaking world, to indicate the concept "yes" (e.g. "yes; this has been verified", "yes; that is the correct answer", "yes; this has ...
Square root. Notation for the (principal) square root of x. For example, √ 25 = 5, since 25 = 5 ⋅ 5, or 52 (5 squared). In mathematics, a square root of a number x is a number y such that ; in other words, a number y whose square (the result of multiplying the number by itself, or ) is x. [1] For example, 4 and −4 are square roots of 16 ...
v. t. e. The 1800s (pronounced "eighteen-hundreds") was a decade of the Gregorian calendar that began on 1 January 1800, and ended on 31 December 1809. The term "eighteen-hundreds" could also mean the entire century from 1 January 1800 to 31 December 1899 (the years beginning with "18"), and is almost synonymous with the 19th century (1801–1900).