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energy-level diagram

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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

Chinese pictograph, calligraphy tablet of Huang Tingjian, a famous calligrapher in Ancient Song Dynasty. The background of Chinese cultural elements.

The World’s 5 Most Commonly Used Writing Systems

Marriage. A couple getting married during a church wedding ceremony. (religion, ceremony, bride, groom)

The Seven Sacraments of the Roman Catholic church

Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics

10 Best Hockey Players of All Time

Queen Elizabeth II addresses at opening of Parliament. (Date unknown on photo, but may be 1958, the first time the opening of Parliament was filmed.)

All 119 References in “We Didn’t Start the Fire,” Explained

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

July, 2006, Launch of Space Shuttle Discovery STS-121. See attached for full caption information.

Will Light-Speed Space Travel Ever Be Possible?

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Facts

Also Known As	free radical

Photos

energy-level diagram

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Topics

allyl methyl ethyl benzoyloxy cyclopentadienyl radical scavenger triphenylmethyl naphthyl diphenylnitrogen oxide alkylidene diatomic molecule ion biomolecule configuration conformation monomer macromolecule molecular weight

Key People

Justus von Liebig

Justus, baron von Liebig

German chemist

Gerhard Herzberg

Canadian physicist

Friedrich Adolf Paneth

Austrian chemist

Moses Gomberg

American chemist