sum tone

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Statue of Nostradamus

Nostradamus and His Prophecies

Salem Witch Trials. Photogravure after the painting by Walter McEwen titled - The Witches - circa 1890s.

How Rye Bread May Have Caused the Salem Witch Trials

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Paul Revere. "The bloody massacre perpetrated in King Street Boston on March 5th 1770 by a party of the 29th Regt.," engraved by Paul Revere. Boston Massacre.

There’s a Riot Goin’ On: Riots in U.S. History (Part One)

Nelson Mandela, undated photo.

15 Nelson Mandela Quotes

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

Middle East bee locator map

Are the Middle East and the Near East the Same Thing?

sum tone

sound

Learn about this topic in these articles:

sound perception

In sound: The ear as spectrum analyzer
…of new pure tones: the sum tones,and the difference tones,
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