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Inventions

Inventions
When was the first elevator built?

1743
1785
1760
1739

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Inventions
When was the toothbrush invented?

1790
1742
1770
1765

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Inventions
In which decade were the first successful diode and triode vacuum tubes invented?

1890s
1880s
1800s
1900s

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Inventions
This African-American woman physical therapist worked with soldiers disabled in World War II. She invented a device that helped the disabled to eat by delivering food through a tube to a mouthpiece.

Beulah Henry
Marjorie Joyner
Mae Jamison
Bessie Blount

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Inventions
Which scientist discovered the radioactive element radium?

Marie Curie
Isaac Newton
Benjamin Franklin
Albert Einstein

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Inventions
In which year was MIDI introduced?

1973
1983
1977
1987

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