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6 hours ago · Casio F-91W digital watch, one of the most popular watches ever. A clock or chronometer is a device that measures and displays time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year. Devices operating on several physical ...
6 hours ago · Heraclitus ( / ˌhɛrəˈklaɪtəs /; Greek: Ἡράκλειτος Herákleitos; fl. c. 500 BC) was an ancient Greek pre-Socratic philosopher from the city of Ephesus, which was then part of the Persian Empire. He exerts a wide influence on Western philosophy, including the works of Plato and Aristotle. Little is known of Heraclitus's life.
1 day ago · Africa. Africa is the world's second largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [7] With 1.4 billion people [1] [2] as of 2021, it accounts for about 18% of the world's human ...
- 46.1/km² (119.4/sq mi) (2021)
- 54+2*+5** (*disputed) (**territories)
6 hours ago · Albert Einstein proposed [3] [4] three tests of general relativity, subsequently called the "classical tests" of general relativity, in 1916: the perihelion precession of Mercury 's orbit. the deflection of light by the Sun. the gravitational redshift of light. In the letter to The Times (of London) on November 28, 1919, he described the theory ...
1 day ago · Hypertension, also known as high blood pressure, is a long-term medical condition in which the blood pressure in the arteries is persistently elevated. [9] High blood pressure usually does not cause symptoms itself. [1] It is, however, a major risk factor for stroke, coronary artery disease, heart failure, atrial fibrillation, peripheral ...
- Usually lifestyle and genetic factors
- None
- 9.4 million / 18% (2010)
- Lifestyle changes, medications
1 day ago · In mathematics, sine and cosine are trigonometric functions of an angle.The sine and cosine of an acute angle are defined in the context of a right triangle: for the specified angle, its sine is the ratio of the length of the side that is opposite that angle to the length of the longest side of the triangle (the hypotenuse), and the cosine is the ratio of the length of the adjacent leg to that ...
6 hours ago · If you have trouble playing the files, see Wikipedia Media help. The phonology of Japanese features a phonemic inventory including five vowels ( /a, e, i, o, u/) and 12 [1] or more consonants (the number of consonant phonemes varies greatly depending on how certain sounds are analyzed). The phonotactics are relatively simple, allowing for few ...
