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Yandex LLC (Russian: Яндекс, romanized: Yandeks, IPA:) is a Russian multinational technology company providing Internet-related products and services, including an Internet search engine called Yandex Search, launched in 1997, information services, e-commerce, transportation, maps and navigation, mobile applications, and online advertising.
1989 Tiananmen Square protests and massacre Part of the Cold War, the Revolutions of 1989 and the Chinese democracy movement Protesters in Tiananmen Square (left); Chinese tanks in Beijing (right) Date Initial protests: 15 April – 4 June 1989 (1 month, 2 weeks and 6 days) Massacre: 4 June 1989; 34 years ago Location Beijing, China and 400 cities nationwide Tiananmen Square 39°54′12″N ...
Sensitivity (true positive rate) is the probability of a positive test result, conditioned on the individual truly being positive. Specificity (true negative rate) is the probability of a negative test result, conditioned on the individual truly being negative. If the true status of the condition cannot be known, sensitivity and specificity can ...
Website. www .phoenix .gov. Phoenix ( / ˈfiːnɪks / FEE-niks; [8] Spanish: Fénix; [9] [10]) is the capital and most populous city of the U.S. state of Arizona, with 1,608,139 residents as of 2020. [11] It is the fifth-most populous city in the United States and the most populous state capital in the country.
In mathematics. 50 as the sum of two non-zero squares. Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 1 2 + 7 2 = 5 2 + 5 2 (see image). [1] It is also the sum of three squares, 50 = 3 2 + 4 2 + 5 2, and the sum of four squares, 50 = 6 2 + 3 2 + 2 2 + 1 2. It is a Harshad number.
History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...
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