Alfred J Gross invented this for doctors, who didn't like it, although the last people to use it were hospital doctors. Mind you, the tech behind it also powers garage openers. What is it?
At 11:38 a.m., on January 28, 1986, just 74 seconds into its 10th mission, an O-ring ruptured, setting off a fiery explosion in the main fuel tank of which space shuttle?
Wood's glass, which blocks most wavelengths of light, was originally used to encode messages. What kind of light does it let through?
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Quiz with a blend of knowledge.
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Take the Knowledge Quiz.
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Quiz on literature
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History Quiz
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Quiz About History
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History Knowledge Test
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10 questions about history!
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Elementary School History Quiz
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Challenging Quiz About History
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History Quiz
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History Quiz
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Challenging Geography Quiz
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Geography Quiz
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Geography Quiz
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Geography Quiz
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Geography Quiz
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10 Geography Questions
Where did you go?
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Geography Quiz
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What was your last travel destination?
HARD Geography Quiz
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Music Quiz
Have you ever been to a concert?
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Think you know your Beatles from your Stones?
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Challenging Music Quiz
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Music Quiz
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Music Quiz
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Challenging Music Quiz.
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Quiz about Music
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Play this music quiz by clicking here
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Play Music Quiz
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Mad Science Quiz
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Play This Science Quiz
Only for quizzers with an high IQ
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HARD Science Quiz
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HARD Science Quiz
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Are you a Science Expert?
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Science Quiz
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Nobody can score a perfect 10
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Are you a scientist?
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Nobody can score higher than a lousy 5
Science Quiz
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Do You Know Who Sang These Songs?
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Who Sang These Songs From The 70s?
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For people who are older than 40 this is going to be a hard quiz!
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Who Sang These Songs From The 70s?
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Who Sang These Songs
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Who Sang These Songs? - Sudden End Style
How many songs didn't you know?
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0% knows the answer to this question:
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Who Sang These Songs?
Please tell us if you know more than 6 songs
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Who Sang These Songs?
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Who Sang These Songs?
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Challenging Food Quiz
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Food and Beverage Quiz
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Food and Beverage Quiz
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Food and Beverage Quiz
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Food & Beverages Quiz
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Test Your Culinary Knowledge with this Delicious Quiz
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Food Quiz
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Unknown Fruit Quiz
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Mixed Trivia Quiz
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General Knowledge Quiz
Can you beat a 6 out of 10
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Trivia Quiz For Geniuses
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General Knowledge Quiz
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10 Challenging Questions
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This quiz is extremely challenging!
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HARD General Knowledge Quiz
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No human soul will be able to answer these questions
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Hard Trivia Quiz
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Literature Quiz
Who is your favorite author?
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Literature Quiz
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Literature Quiz
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Literature Test
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Tell us, what do you really know about literature?
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Movie Quiz Challenge
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how often do you go to the movie theater?
Movie Quiz
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Movie Quiz
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Movie Quiz
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Movie Quiz
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Movie Quiz
What is the last movie you have seen?
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Movie Quiz
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Movies: 10 Daunting Questions
We hope you have watched enough movies
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Only 10% can complete all 10 of these movie titles
Movie Title Quiz
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"Planet of the …..
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Math Quiz
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Math Quiz
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Challenging Math Quiz
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Can you solve this?
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Mathematics Quiz
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HARD Math Quiz
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Mathematics Quiz
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No one can score a 7 or better
Math Test
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Math Quiz
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