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  4. Who discovered the first exoplanet orbiting a sun-like star?

    Who discovered the first exoplanet orbiting a sun-like star?

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  5. What is the largest spider in the world by leg span?

    What is the largest spider in the world by leg span?

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  7. U.S History Facts: Pentagon - The Nation's Pride

    U.S History Facts: Pentagon - The Nation's Pride

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  8. What is the most common metal found on Earth?

    What is the most common metal found on Earth?

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  9. Which planet is the hottest in our solar system?

    Which planet is the hottest in our solar system?

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  10. What is the largest organ in the human body?

    What is the largest organ in the human body?

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  11. What unit is used to measure the intensity of light?

    What unit is used to measure the intensity of light?

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  12. What branch of zoology focuses on the study of birds?

    What branch of zoology focuses on the study of birds?

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  13. 10 HARD History Questions

    10 HARD History Questions

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  15. Very Challenging History Quiz

    Very Challenging History Quiz

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  17. Challenging History Questions

    Challenging History Questions

    1
  18. Impossible History Quiz

    Impossible History Quiz

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  19. 10 Questions about History

    10 Questions about History

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  20. Interesting History Questions

    Interesting History Questions

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