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Q240
what did isaac newton do
Isaac Newton
Newton's Principia formulated the laws of motion and universal gravitation that dominated scientists' view of the physical universe for the next three centuries.
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Q240
what did isaac newton do
Isaac Newton
It also demonstrated that the motion of objects on the Earth and that of celestial bodies could be described by the same principles.
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Q240
what did isaac newton do
Isaac Newton
By deriving Kepler's laws of planetary motion from his mathematical description of gravity, Newton removed the last doubts about the validity of the heliocentric model of the cosmos.
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Q240
what did isaac newton do
Isaac Newton
Newton built the first practical reflecting telescope and developed a theory of colour based on the observation that a prism decomposes white light into the many colours of the visible spectrum .
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Q240
what did isaac newton do
Isaac Newton
He also formulated an empirical law of cooling and studied the speed of sound .
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Q240
what did isaac newton do
Isaac Newton
In addition to his work on the calculus, as a mathematician Newton contributed to the study of power series , generalised the binomial theorem to non-integer exponents, and developed Newton's method for approximating the roots of a function .
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Q240
what did isaac newton do
Isaac Newton
Newton was a fellow of Trinity College and the second Lucasian Professor of Mathematics at the University of Cambridge .
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Q240
what did isaac newton do
Isaac Newton
He was a devout but unorthodox Christian and, unusually for a member of the Cambridge faculty, he refused to take holy orders in the Church of England , perhaps because he privately rejected the doctrine of trinitarianism .
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Q240
what did isaac newton do
Isaac Newton
In addition to his work on the mathematical sciences, Newton also dedicated much of his time to the study of alchemy and biblical chronology , but most of his work in those areas remained unpublished until long after his death.
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Q240
what did isaac newton do
Isaac Newton
In his later life, Newton became president of the Royal Society .
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Q240
what did isaac newton do
Isaac Newton
He also served the British government as Warden and Master of the Royal Mint .
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Prof. Walter Lewin explains Newton's law of gravitation in MIT course 8.01
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Satellites and projectiles all obey Newton's law of gravitation
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Newton's law of universal gravitation states that every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
(Separately it was shown that large spherically symmetrical masses attract and are attracted as if all their mass were concentrated at their centers .)
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
This is a general physical law derived from empirical observations by what Newton called induction .
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
It is a part of classical mechanics and was formulated in Newton's work Philosophiæ Naturalis Principia Mathematica ("the Principia"), first published on 5 July 1687.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
(When Newton's book was presented in 1686 to the Royal Society , Robert Hooke made a claim that Newton had obtained the inverse square law from him – see History section below.)
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
In modern language, the law states the following:
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Assuming SI units , F is measured in newtons (N), m1 and m2 in kilograms (kg), r in meters (m), and the constant G is approximately equal to .
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
The value of the constant G was first accurately determined from the results of the Cavendish experiment conducted by the British scientist Henry Cavendish in 1798, although Cavendish did not himself calculate a numerical value for G.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
This experiment was also the first test of Newton's theory of gravitation between masses in the laboratory.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
It took place 111 years after the publication of Newton's Principia and 71 years after Newton's death, so none of Newton's calculations could use the value of G; instead he could only calculate a force relative to another force.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Newton's law of gravitation resembles Coulomb's law of electrical forces, which is used to calculate the magnitude of electrical force between two charged bodies.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Both are inverse-square laws , in which force is inversely proportional to the square of the distance between the bodies.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Coulomb's Law has the product of two charges in place of the product of the masses, and the electrostatic constant in place of the gravitational constant.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Newton's law has since been superseded by Einstein's theory of general relativity , but it continues to be used as an excellent approximation of the effects of gravity.
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Q241
what does the universal law of gravitation state
Newton's law of universal gravitation
Relativity is required only when there is a need for extreme precision, or when dealing with gravitation for extremely massive and dense objects.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
White and red flags, representing Iraqi and American deaths, sit in the grass quadrangle of The Valley Library on the Corvallis, Oregon , campus of Oregon State University .
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
As part of the traveling Iraq Body Count exhibit from 2008 to 2009 (not related to Iraq Body Count project ), the flags aim to "raise awareness of the human cost of the Iraq War ."
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
(May 2008)
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
Casualties of the conflict in Iraq since 2003 (beginning with the 2003 invasion of Iraq , and continuing with the ensuing occupation of Iraq , as well as the activities of the various armed groups operating in the country) have come in many forms, and the accuracy of the information available on different types of Iraq War casualties varies greatly.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
The table below summarizes various estimates of the Iraqi casualty figures.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
For troops in the U.S.-led multinational coalition , the death toll is carefully tracked and updated daily, and the names and photographs of those killed in action as well as in accidents have been published widely.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
A total of 4,486 U.S. soldiers were killed in Iraq between 2003 and 2012.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
Regarding the Iraqis, however, information on both military and civilian casualties is both less precise and less consistent.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
Estimates of casualty levels are available from reporters on the scene, from officials of involved organizations, and from groups that summarize information on incidents reported in the news media.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
The word " casualties " in its most general sense includes the injured as well as the dead.
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
Accounts of the number of coalition wounded vary widely, partly because it is not obvious what should be counted: should only those injuries serious enough to put a soldier out of commission be included?
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
Do illnesses or injuries caused by accidents count, or should the focus be restricted to wounds caused by hostile engagement?
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Q244
how many US soldiers killed in Iraq war
Casualties of the Iraq War
Sources using different definitions may arrive at very different numbers, and sometimes the precise definition is not clearly specified.
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Q245
How did the highwaymen get their name 1800
Highwayman
Asalto al coche (Robbery of the coach), by Francisco de Goya
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Q245
How did the highwaymen get their name 1800
Highwayman
A highwayman was a thief and brigand who preyed on travellers.
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Q245
How did the highwaymen get their name 1800
Highwayman
This type of outlaw usually travelled and robbed by horse , as compared to a footpad who travelled and robbed on foot.
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Q245
How did the highwaymen get their name 1800
Highwayman
Mounted robbers were widely considered to be socially superior to footpads.
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Q245
How did the highwaymen get their name 1800
Highwayman
Such robbers operated in Great Britain and Ireland from the Elizabethan era until the early 19th century.
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Q245
How did the highwaymen get their name 1800
Highwayman
The word highwayman is first known to be used in the year 1617; other euphemisms included "knights of the road" and "gentlemen of the road."
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Q245
How did the highwaymen get their name 1800
Highwayman
Two terms applied to 19th-century North American highwaymen were road agents in some instances for mountain bandits while in other cases the term is Rlallaala for mountain-based ruffians.
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Q245
How did the highwaymen get their name 1800
Highwayman
In the same time period in Australia , they were known as bushrangers .
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Q246
how did magic johnson get aids
Magic Johnson
Earvin "Magic" Johnson, Jr. (born August 14, 1959) is a retired American professional basketball player who played point guard for the Los Angeles Lakers of the National Basketball Association (NBA).
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Q246
how did magic johnson get aids
Magic Johnson
After winning championships in high school and college , Johnson was selected first overall in the 1979 NBA Draft by the Lakers.
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Q246
how did magic johnson get aids
Magic Johnson
He won a championship and an NBA Finals Most Valuable Player Award in his rookie season, and won four more championships with the Lakers during the 1980s.
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Q246
how did magic johnson get aids
Magic Johnson
Johnson retired abruptly in 1991 after announcing that he had contracted HIV , but returned to play in the 1992 All-Star Game , winning the All-Star MVP Award .
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Q246
how did magic johnson get aids
Magic Johnson
After protests from his fellow players, he retired again for four years, but returned in 1996, at age 36, to play 32 games for the Lakers before retiring for the third and final time.
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Q246
how did magic johnson get aids
Magic Johnson
Johnson's career achievements include three NBA MVP Awards , nine NBA Finals appearances, twelve All-Star games, and ten All-NBA First and Second Team nominations.
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Q246
how did magic johnson get aids
Magic Johnson
He led the league in regular-season assists four times, and is the NBA's all-time leader in average assists per game, at 11.2.
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Q246
how did magic johnson get aids
Magic Johnson
Johnson was a member of the " Dream Team ", the U.S. basketball team that won the Olympic gold medal in 1992.
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Q246
how did magic johnson get aids
Magic Johnson
After leaving the NBA in 1992, Johnson formed the Magic Johnson All-Stars, a barnstorming team that travelled around the world playing exhibition games .
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Q246
how did magic johnson get aids
Magic Johnson
Johnson was honored as one of the 50 Greatest Players in NBA History in 1996, and enshrined in the Basketball Hall of Fame in 2002.
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Q246
how did magic johnson get aids
Magic Johnson
He was rated the greatest NBA point guard of all time by ESPN in 2007.
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Q246
how did magic johnson get aids
Magic Johnson
His friendship and rivalry with Boston Celtics star Larry Bird , whom he faced in the 1979 NCAA finals and three NBA championship series, were well documented.
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Q246
how did magic johnson get aids
Magic Johnson
Since his retirement, Johnson has been an advocate for HIV/ AIDS prevention and safe sex , as well as an entrepreneur , philanthropist , broadcaster and motivational speaker .
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Q246
how did magic johnson get aids
Magic Johnson
Johnson was a part-owner of the Lakers for several years, and was part of a group that purchased the Los Angeles Dodgers in 2012.
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Q247
how does a cell function
Cell (biology)
Allium cells in different phases of the cell cycle
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Q247
how does a cell function
Cell (biology)
The cells of eukaryotes (left) and prokaryotes (right)
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Q247
how does a cell function
Cell (biology)
The cell is the basic structural, functional and biological unit of all known living organisms .
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Q247
how does a cell function
Cell (biology)
It is the smallest unit of life that is classified as a living thing (except virus , which consists only from DNA/RNA covered by protein and lipids ), and is often called the building block of life.
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Q247
how does a cell function
Cell (biology)
It consists of a protoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids .
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Q247
how does a cell function
Cell (biology)
Organisms can be classified as unicellular (consisting of a single cell; including most bacteria ) or multicellular (including plants and animals ).
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Q247
how does a cell function
Cell (biology)
While the number of cells in plants and animals varies from species to species, Humans contain about 100 trillion (1014) cells.
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Q247
how does a cell function
Cell (biology)
Most plant and animal cells are between 1 and 100 micrometres and therefore are visible only under the microscope.
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Q247
how does a cell function
Cell (biology)
The cell was discovered by Robert Hooke in 1665.
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Q247
how does a cell function
Cell (biology)
The cell theory , first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann , states that all organisms are composed of one or more cells, that all cells come from preexisting cells, that vital functions of an organism occur within cells, and that all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.
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Q247
how does a cell function
Cell (biology)
Cells emerged on planet Earth at least 4.0–4.3 billion years ago.
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Q247
how does a cell function
Cell (biology)
The word cell comes from the Latin cella, meaning "small room".
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Q247
how does a cell function
Cell (biology)
The descriptive term for the smallest living biological structure was coined by Robert Hooke in a book he published in 1665 when he compared the cork cells he saw through his microscope to the small rooms monks lived in.
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Q249
how does grecian formula work?
Grecian Formula
Grecian Formula is a men's hair coloring product in the United States.
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Q249
how does grecian formula work?
Grecian Formula
Canada and Europe previously banned the product because of its use of lead acetate.
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Q250
what are projection headlights
Headlamp
A motor scooter 's front with an impractical number and variety of headlamps, added for decorative purposes
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Q250
what are projection headlights
Headlamp
A headlamp is a lamp attached to the front of a vehicle to light the road ahead.
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Q250
what are projection headlights
Headlamp
Headlamp performance has steadily improved throughout the automobile age, spurred by the great disparity between daytime and nighttime traffic fatalities: the U.S. National Highway Traffic Safety Administration states that nearly half of all traffic-related fatalities occur in the dark, despite only 25% of traffic travelling during darkness.
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Q250
what are projection headlights
Headlamp
While it is common for the term headlight to be used interchangeably in informal discussion, headlamp is the term for the device itself, while headlight properly refers to the beam of light produced and distributed by the device.
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Q250
what are projection headlights
Headlamp
Other vehicles, such as trains and aircraft , are required to have headlamps.
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Q250
what are projection headlights
Headlamp
Bicycle headlamps are often used on bicycles, and are required in some jurisdictions.
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Q250
what are projection headlights
Headlamp
They can be powered by a battery or a small electrical generator on the wheel.
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Q250
what are projection headlights
Headlamp
Additionally automotive night vision systems work to supplement headlamps.
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Q251
How did women work for equal rights during the women's movement? Were their efforts successful?
Women's rights
Women's rights are the rights and entitlements claimed for women and girls of many societies worldwide.
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Q251
How did women work for equal rights during the women's movement? Were their efforts successful?
Women's rights
In some places these rights are institutionalized or supported by law, local custom, and behaviour, whereas in others they may be ignored or suppressed.
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Q251
How did women work for equal rights during the women's movement? Were their efforts successful?
Women's rights
They differ from broader notions of human rights through claims of an inherent historical and traditional bias against the exercise of rights by women and girls in favour of men and boys.
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Q251
How did women work for equal rights during the women's movement? Were their efforts successful?
Women's rights
Issues commonly associated with notions of women's rights include, though are not limited to, the right: to bodily integrity and autonomy; to vote (suffrage); to hold public office; to work; to fair wages or equal pay; to own property ; to education ; to serve in the military or be conscripted; to enter into legal contracts; and to have marital, parental and religious rights.
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Q252
how many times has whoopi been married
Whoopi Goldberg
Caryn Elaine Johnson, best known as Whoopi Goldberg (, (born November 13, 1955) is an American comedienne, actress, singer-songwriter, political activist, author and talk show host.
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Q252
how many times has whoopi been married
Whoopi Goldberg
Goldberg made her film debut in The Color Purple (1985), playing Celie, a mistreated black woman in the Deep South.
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Q252
how many times has whoopi been married
Whoopi Goldberg
She received a nomination for the Academy Award for Best Actress and won her first Golden Globe Award for her role in the film.
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Q252
how many times has whoopi been married
Whoopi Goldberg
In 1990, she played Oda Mae Brown, a wacky psychic helping a slain man ( Patrick Swayze ) save his lover ( Demi Moore ) in the blockbuster Ghost .
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Q252
how many times has whoopi been married
Whoopi Goldberg
This performance won her a second Golden Globe and an Academy Award for Best Supporting Actress ; this made Goldberg only the second black woman in the history of the Academy Awards to win an acting Oscar—the first being Hattie McDaniel who won for Gone With the Wind in 1939.
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Q252
how many times has whoopi been married
Whoopi Goldberg
Notable later films include Sister Act and Sister Act 2 , The Player , Made in America , How Stella Got Her Groove Back , Girl, Interrupted and Rat Race .
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Q252
how many times has whoopi been married
Whoopi Goldberg
She is also acclaimed for her roles as the bartender Guinan in Star Trek: The Next Generation , as Terry Doolittle in Jumpin' Jack Flash , and as Carmen Tibideaux in Glee , as well as the voice of Shenzi the hyena in The Lion King .
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Q252
how many times has whoopi been married
Whoopi Goldberg
Goldberg has been nominated for 13 Emmy Awards for her work in television.
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Q252
how many times has whoopi been married
Whoopi Goldberg
She was co-producer of the popular game show Hollywood Squares from 1998 to 2004.
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Q252
how many times has whoopi been married
Whoopi Goldberg
She has been the moderator of the daytime talk show The View since 2007.
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