helium
The many uses for helium, but are we running out of it?
© American Chemical Society (A Britannica Publishing Partner)
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Encyclopædia Britannica, Inc.Millikan oil-drop experiment.
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© World Science Festival (A Britannica Publishing Partner)Brian Greene explains how the revolutionary idea of quantum mechanics is that reality evolves through a game of chance described by probabilities. This video is an episode in his Daily Equation series.
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Encyclopædia Britannica, Inc.Discussion of four attempts to explain the structure of the solar system, from Aristotle to Johannes Kepler.
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Encyclopædia Britannica, Inc.Gbowee is known for rallying women to pressure leaders into ending Liberia's civil war.
