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Correct Answer: A) Godtfred Kirk Christiansen.
Correct Answer: B) Sir William Grove.
Correct Answer: B) Invention.
Correct Answer: C) Different types.
Correct Answer: D) 1880's.
Correct Answer: B) Problem.
Correct Answer: B) A device that uses electricity to perform a function.
Correct Answer: D) An island that lies off the south east coast of Africa.
Correct Answer: B) 1945.
Correct Answer: D) Barbed wire.
Correct Answer: C) Bifocal spectacles.
Correct Answer: B) Orbit.
Correct Answer: A) Alexandria.
Correct Answer: D) Heaven.
Correct Answer: B) The ballpoint pen.
Correct Answer: D) 1951.
Correct Answer: C) A. Nobel.
Correct Answer: B) Play-Doh.
Correct Answer: C) Aeroplane.
Correct Answer: A) Charles Macintosh.
Correct Answer: A) It allowed factories to stay open longer and increased productivity.
Correct Answer: D) Tin.
Correct Answer: C) The U.S. government.
Correct Answer: D) 59.