Inventions

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3.
What J. B. Dunlop invented?

A. Pneumatic rubber tire
B. Automobile wheel rim
C. Rubber boot
D. Model airplanes


Explanation:

Invented in 1887.

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4.
Which scientist discovered the radioactive element radium?

A. Isaac Newton
B. Albert Einstein
C. Benjamin Franklin
D. Marie Curie



5.
When was barb wire patented?

A. 1874
B. 1840
C. 1895
D. 1900


Explanation:

Joseph F. Glidden was born in New York on Jan. 18, 1812. He invented barbed wire in 1873 and was granted the patent on Nov. 24, 1874. After a three year battle over the patent, which he eventually won, Gidden became known as the "Father of Barbed Wire".