What are neutrinos?
Neutrinos are objects produced by the decay of certain subatomic particles.
They have energy but little or no mass, and they travel almost at the speed of light.
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What is glass made of?
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At any given time on a clear night in a dark place with no obstructions on the horizon, 2,500 stars are visible to the naked eye.
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Has anyone ever been hit by a meteorite?
At least two people have been hit by a meteorite. In September 1954, Mrs. Hewlett Hodges of Sylacauga, Alabama, was hit by a meteorite as she napped in her living room. The rock from space weighed about 10 pounds. In the late 1930s, a Japanese girl was also hit by a small meteorite.
Which U.S. federal agency employs the most people?
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