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Question 1 of 10
A Chinese eunuch named Cai Lun (or Ts'ai Lun) is credited with using bark, hemp, rags and fishnets to invent something in 105 AD. What?
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Question 2 of 10
Named for Friedrich Mohs and determined with a sclerometer, what does the Mohs scale measure?
Question 3 of 10
Chromium was named because it's so colorful, and chlorine was named because it is often one particular color. Which one?
Question 4 of 10
Sputnik 2 took Laika into space. What kind of animal was Laika?
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Question 5 of 10
What do gluons "glue" together within hadrons, like protons and neutrons?
Question 6 of 10
What hirsute part of the body interests somebody who studies pogonology?
Question 7 of 10
Which of these tiger subspecies is not either extinct already, or a few hundred wild animals away from extinction?
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Question 8 of 10
With a name literally meaning "hollow cavity," what is the largest vein in your body?
Question 9 of 10
Which of these toolbox items operates on the wheel and axle principle?
Question 10 of 10
West Nile Fever, a mosquito-borne viral infection that can cause inflammation of the brain, was first isolated in the West Nile district of what country in 1937?
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