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Comment Re:Better Audio Speakers, Mics, Ultrasound, Sonar? (Score 1) 91

Mechanical vibrations are used to measure molecular relaxations in polymers (rheology and dynamic mechanical analysis). The devices I am most familiar with have an upper limit of about 100 hz, however, by controlling the temperature high frequencies can be effectively measured.

Stellar rays prove fibbing never pays. Embezzlement is another matter.

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