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Author
Pub. Date
[2022]
Language
English
Description
"In 2011, without warning, a skyscraper in South Korea began to shake uncontrollably and was immediately evacuated. Was it an earthquake? A terrorist attack? No one seemed quite sure. The actual cause emerged later: Twenty-three middle-aged Koreans were having a Tae Bo fitness class in the office gym on the twelfth floor. Their beats had inadvertently matched the building's natural frequency, and this coincidence caused the building to shake at an...
2) Sound
Author
Series
Pub. Date
1998.
Language
English
Description
Questions and answers and activities explore the definition, cause, effects, and uses of sound.
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