Science

What is the name for a tool that makes work easier to do?

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Which Apollo mission was launched on April 11, 1970?
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What liquid is used as a standard when measuring density?
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What distinction does Mira (Omicron Ceti) hold in astronomy?
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Which of these is not a Galilean satellite?
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Who invented the most common bacterial medium?
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What metal is used for most electrical wire and cable?
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About how long does it take for sunlight to reach the Earth from the Sun?
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What season is between winter and summer?
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