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What is the age of the universe and how do we know this?
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Asafe and responsible driver must have a. a positive attitude towards driving b. a friend in the car to navigate c. a gps system d. the ability to drive aggressively
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How many neutrons does an element have if its atomic number is 40 and its mass number is 156?
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What is the age of the universe and how do we know this?...
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