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The Northrop Grumman B-2 Spirit,also known as the Stealth Bomber,is an American heavy strategic bomber,featuring low-observable stealth technology designed to penetrate dense anti-aircraft defenses. A subsonic flying wing with a crew of two,the plane was designed by Northrop and produced from 1987 to 2000. The bomber can drop conventional and thermonuclear weapons,such as up to eighty 500-pound class (230 kg) Mk 82 JDAM GPS-guided bombs,or sixteen 2,400-pound (1,100 kg) B83 nuclear bombs. The B-2 is the only acknowledged in-service aircraft that can carry large air-to-surface standoff weapons in a stealth configuration.
In mathematics,the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers,commonly denoted Fn . The sequence commonly starts from 0 and 1,although some authors start the sequence from 1 and 1 or sometimes from 1 and 2. Starting from 0 and 1,the sequence begins
In geography,latitude is a coordinate that specifies the north–south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from –90°at the south pole to 90°at the north pole,with 0°at the Equator. Lines of constant latitude,or parallels,run east–west as circles parallel to the equator. Latitude and longitude are used together as a coordinate pair to specify a location on the surface of the Earth.
In statistics,a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is
Oxygen is a chemical element;it has symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table,a highly reactive nonmetal,and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is the most abundant element in Earth's crust,and after hydrogen and helium,it is the third-most abundant element in the universe. At standard temperature and pressure,two atoms of the element bind to form dioxygen,a colorless and odorless diatomic gas with the formula O
2. Diatomic oxygen gas currently constitutes 20.95% of the Earth's atmosphere,though this has changed considerably over long periods of time. Oxygen makes up almost half of the Earth's crust in the form of oxides.
The number π is a mathematical constant that is the ratio of a circle's circumference to its diameter,approximately equal to 3.14159. The number π appears in many formulae across mathematics and physics. It is an irrational number,meaning that it cannot be expressed exactly as a ratio of two integers,although fractions such as are commonly used to approximate it. Consequently,its decimal representation never ends,nor enters a permanently repeating pattern. It is a transcendental number,meaning that it cannot be a solution of an equation involving only finite sums,products,powers,and integers. The transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straightedge. The decimal digits of π appear to be randomly distributed,but no proof of this conjecture has been found.
A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example,5 is prime because the only ways of writing it as a product,1 ×5 or 5 ×1,involve 5 itself. However,4 is composite because it is a product (2 × 2) in which both numbers are smaller than 4. Primes are central in number theory because of the fundamental theorem of arithmetic:every natural number greater than 1 is either a prime itself or can be factorized as a product of primes that is unique up to their order.
Quantum mechanics is a fundamental theory in physics that describes the behavior of nature at and below the scale of atoms. It is the foundation of all quantum physics including quantum chemistry,quantum field theory,quantum technology,and quantum information science.
In statistics,the standard deviation is a measure of the amount of variation of a random variable expected about its mean. A low standard deviation indicates that the values tend to be close to the mean of the set,while a high standard deviation indicates that the values are spread out over a wider range.
In probability theory and statistics,variance is the expected value of the squared deviation from the mean of a random variable. The standard deviation (SD) is obtained as the square root of the variance. Variance is a measure of dispersion,meaning it is a measure of how far a set of numbers is spread out from their average value. It is the second central moment of a distribution,and the covariance of the random variable with itself,and it is often represented by ,,,,or .
2 (two) is a number,numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and only even prime number. Because it forms the basis of a duality,it has religious and spiritual significance in many cultures.
4 (four) is a number,numeral and digit. It is the natural number following 3 and preceding 5. It is a square number,the smallest semiprime and composite number,and is considered unlucky in many East Asian cultures.
5 (five) is a number,numeral and digit. It is the natural number,and cardinal number,following 4 and preceding 6,and is a prime number. It has garnered attention throughout history in part because distal extremities in humans typically contain five digits.
Javier Hernández Balcázar,commonly known by the nickname Chicharito,is a Mexican professional footballer who plays as a striker for Liga MX club Guadalajara. He is known for his clinical finishing along with his pace and technical ability and is widely considered to be amongst the greatest Mexican players of all time.
The PlayStation 2 (PS2) is a home video game console developed and marketed by Sony Interactive Entertainment. It was first released in Japan on 4 March 2000,in North America on 26 October 2000,in Europe on 24 November 2000,and in Australia on 30 November 2000. It is the successor to the original PlayStation,as well as the second installment in the PlayStation brand of consoles. As a sixth-generation console,it competed with Nintendo's GameCube,Sega's Dreamcast,and Microsoft's Xbox. It is the best-selling video game console of all time,having sold over 155 million units worldwide,nearly triple the combined sales of the Dreamcast,GameCube,and Xbox.
The Academy Award for Best Actor is an award presented annually by the Academy of Motion Picture Arts and Sciences (AMPAS). It has been awarded since the 1st Academy Awards to an actor who has delivered an outstanding performance in a leading role in a film released that year. The award is traditionally presented by the previous year's Best Actress winner.
The Academy Award for Best Actress is an award presented annually by the Academy of Motion Picture Arts and Sciences (AMPAS). It has been awarded since the 1st Academy Awards to an actress who has delivered an outstanding performance in a leading role in a film released that year. The award is traditionally presented by the previous year's Best Actor winner.
In mathematics,the Pythagorean theorem or Pythagoras' theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle. It states that the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other two sides.
Diabetes mellitus,often known simply as diabetes,is a group of common endocrine diseases characterized by sustained high blood sugar levels. Diabetes is due to either the pancreas not producing enough insulin,or the cells of the body becoming unresponsive to the hormone's effects. Classic symptoms include thirst,polyuria,weight loss,and blurred vision. If left untreated,the disease can lead to various health complications,including disorders of the cardiovascular system,eye,kidney,and nerves. Untreated or poorly treated diabetes accounts for approximately 1.5 million deaths every year.
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