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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

Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

King Cobra snake in Malaysia. (reptile)

9 of the World’s Deadliest Snakes

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

Aspirin pills.

7 Drugs that Changed the World

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

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Topics

augmented sixth chord broken chord root triad minor triad major triad augmented triad diminished triad chord progression harmony cadence key basso continuo microtonal music chromaticism appoggiatura consonance and dissonance polytonality suspension

Quiz

Young girl wearing a demin jacket playing the trumpet (child, musical instruments, Asian ethnicity)

Sound Check: Musical Vocabulary Quiz