It would take about 100,000 years to walk a light-year at a normal walking pace.
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The barometer measures atmospheric pressure.
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The Cavendish experiment measured the density of the Earth using lead spheres.
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The discovery of anesthesia allowed painless surgical procedures.
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There are invisible colors humans cannot see.
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In 2005, scientists teleported quantum information between particles.
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Energy and mass are interchangeable.
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