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Portal is a series of first-person puzzle-platform video games developed by Valve.Set in the Half-Life universe, the two main games in the series, Portal (2007) and Portal 2 (2011), center on a woman, Chell, forced to undergo a series of tests within the Aperture Science Enrichment Center by a malicious artificial intelligence, GLaDOS, that controls the facility.
Tiffany Lynn Alvord (born December 11, 1992) is an American singer, songwriter and actress. She has been cited as one of YouTube 's first "home-grown celebrities". [1] She has a large social presence on YouTube with over 705 million video views and over 3.15 million subscribers. [2]
RU. Internet TLD. .ru. .рф. Russia, [b] or the Russian Federation, [c] is a country spanning Eastern Europe and North Asia. It is the largest country in the world by area, extending across eleven time zones and sharing land borders with fourteen countries. [d] It is the world's ninth-most populous country and Europe's most populous country.
William Alvord (January 3, 1833 – December 21, 1904) was an American merchant, banker and political leader in San Francisco. He was the 13th Mayor of San Francisco from 1871 to 1873 and served as president of the Bank of California from 1878 until his death.
Portal. (video game) Portal is a 2007 puzzle - platform game developed and published by Valve. It was released in a bundle, The Orange Box, for Windows, Xbox 360 and PlayStation 3, and has been since ported to other systems, including Mac OS X, Linux, Android (via Nvidia Shield ), and Nintendo Switch .
The population of Alvord, Iowa from US census data 2010 census. As of the census of 2010, there were 196 people, 79 households, and 54 families living in the city. The population density was 700.0 inhabitants per square mile (270.3/km 2). There were 85 housing units at an average density of 303.6 per square mile (117.2/km 2).
Saudi Arabia, [e] officially the Kingdom of Saudi Arabia ( KSA ), [f] is a country in West Asia and the Middle East. It covers the bulk of the Arabian Peninsula and has a land area of about 2 150 000 km 2 ( 830 000 sq mi), making it the fifth-largest country in Asia and the largest in the Middle East.
The standard deviation σ of X is defined as which can be shown to equal. Using words, the standard deviation is the square root of the variance of X . The standard deviation of a probability distribution is the same as that of a random variable having that distribution. Not all random variables have a standard deviation.