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United States Air Force NASA. Number built. 3. The North American X-15 is a hypersonic rocket-powered aircraft operated by the United States Air Force and the National Aeronautics and Space Administration (NASA) as part of the X-plane series of experimental aircraft. The X-15 set speed and altitude records in the 1960s, crossing the edge of ...
One World Trade Center, also known as One WTC and Freedom Tower, [note 1] is the main building of the rebuilt World Trade Center complex in Lower Manhattan, New York City.. Designed by David Childs of Skidmore, Owings & Merrill, One World Trade Center is the tallest building in the United States, the tallest building in the Western Hemisphere, and the seventh-tallest in the
The British Empire (red) and Mongol Empire (blue) were the largest and second-largest empires in history, respectively. The precise extent of the Mongol Empire at its greatest territorial expansion is a matter of debate among scholars. Several empires in human history have been contenders for the largest of all time, depending on definition and ...
The supply of long-term rentals has fallen 15% in a year, while short-term rentals mainly for tourists increased by 56% in the year to March, according to Idealista.
Dunbar's number. Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. [ 1][ 2] This number was first proposed in the 1990s by British anthropologist Robin ...
In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million ( ppm ...
Guyana. Had a number of public lines until the 1970's and industrial lines until around 2007 [ 78] 328. Haiti. Rails still in Port-au-Prince from railway from factories to port, left out of service since the 1970s. 332. Iceland. Had short industrial lines, see Rail transport in Iceland for proposals. 352.
Histogram equalization accomplishes this by effectively spreading out the highly populated intensity values which are used to degrade image contrast. The method is useful in images with backgrounds and foregrounds that are both bright or both dark. In particular, the method can lead to better views of bone structure in x-ray images, and to ...