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Helium
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Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.
7 Deadliest Weapons in History
Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg
Spies Like Us: 10 Famous Names in the Espionage Game
Illustration for Demystified "How Dangerous is Quicksand"
How Deadly Is Quicksand?
Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.
What Is the Emoluments Clause?
Gutzon Borglum. Presidents. Sculpture. National park. George Washington. Thomas Jefferson. Theodore Roosevelt. Abraham Lincoln. Mount Rushmore National Memorial, South Dakota.
9 Memorials and Monuments in the United States
Drinking water is poured into a glass.
Water Fluoridation: Just the Facts
Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant
7 of the World’s Deadliest Plants

Helium

work by Keesom

Learn about this topic in these articles:

discussed in biography

  • helium
    In Willem Hendrik Keesom

    …in 1926, he successfully solidified helium. In 1932 he achieved the temperature of -457.6° F (-272° C), just two degrees Fahrenheit above absolute zero. His book Helium appeared in 1942.

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