The element helium
The many uses for helium, but are we running out of it?
© American Chemical Society (A Britannica Publishing Partner)
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Contunico © ZDF Studios GmbH, MainzCommuters in the Tokyo area depend on rail transportation, and most pass through Shinjuku station.
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Michael Salisbury/Skylight.cc (A Britannica Publishing Partner)Balloons at the Albuquerque International Balloon Fiesta, New Mexico, 2010.
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Encyclopædia Britannica, Inc.Hot-air ballooning from the Montgolfier brothers to the present.
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Encyclopædia Britannica, Inc.Learn about seven of the largest things that ever took flight.
