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Electromagnetic spectrum. The electromagnetic spectrum is the full range of electromagnetic radiation, organized by frequency or wavelength. The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light ...
The death toll from a tornado outbreak in the U.S. states of Texas, Kentucky, Oklahoma, and Arkansas on Saturday and Sunday increases to 21. (Reuters) Law and crime. A teenager is killed and six other people are injured in a shooting in downtown Lansing, Michigan, United States.
The fall of the Western Roman Empire, also called the fall of the Roman Empire or the fall of Rome, was the loss of central political control in the Western Roman Empire, a process in which the Empire failed to enforce its rule, and its vast territory was divided between several successor polities. The Roman Empire lost the strengths that had ...
Portal. : Christianity. Christianity ( / krɪstʃiˈænɪti / or / krɪstiˈænɪti /) is an Abrahamic monotheistic religion based on the life and teachings of Jesus Christ. It is the world's largest and most widespread religion with roughly 2.4 billion followers, comprising around 31.2% of the world population. Its adherents, known as ...
Viète. de Moivre. Euler. Fourier. v. t. e. In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles.
The Walt Disney World Resort (also known as Walt Disney World or Disney World) is an entertainment resort complex located about 20 miles (32 km) southwest of Orlando, Florida, United States. Opened on October 1, 1971, the resort is operated by Disney Experiences, a division of The Walt Disney Company. The property covers nearly 25,000 acres (39 ...
1 Control-C has typically been used as a "break" or "interrupt" key. 2 Control-D has been used to signal "end of file" for text typed in at the terminal on Unix / Linux systems. Windows, DOS, and older minicomputers used Control-Z for this purpose. 3 Control-G is an artifact of the days when teletypes were in use.
Portal. : Vietnam. Vietnam, officially the Socialist Republic of Vietnam ( SRV ), is a country at the eastern edge of mainland Southeast Asia, with an area of about 331,000 square kilometres (128,000 sq mi) and a population of over 100 million, making it the world's fifteenth-most populous country.