A-Z
No. 
4882

What was the first sound-recording device called?

Phonograph
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No. 
5528
What does the word "lodestone" mean?
Leading Stone
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No. 
5153
Who discovered the neutron and in what year?
James Chadwick In 1932
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No. 
5143
What is the second derivative of displacement?
Instantaneous Acceleration
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No. 
4771
Who invented the mercury thermometer?
Daniel Gabriel Fahrenheit
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No. 
4158
How fast does light travel in one second?
186,000 Miles Per Second
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No. 
3995
What is the energy of moving parts called?
Mechanical Energy
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