FACTOID # 19: Cheap sloppy joes: Looking for reduced-price lunches for schoolchildren? Head for Oklahoma!
 
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Encyclopedia > Sir Purr

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purr: Definition and Much More From Answers.com (498 words)
Cats purr at 27 - 44 hertz, and exposure to similar sound frequencies is known to improve bone density in humans.
One speculation is that it is a signalling mechanism between mother cat and nursing kittens.
Female cats are known to purr while giving birth, and this may be to reduce the pain and also assist post-natal healing.
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