Mice have very sensitive ears and can hear ultrasound of high-intensity wavelengths. They hate the sound of ultrasonic rodent repellent devices, which is usually in the range of 32 kHz to 62 kHz. The sound of these ultrasonic rodent repellers may it extremely irritating for these filthy creatures.
In the end, Boy Willie heads back down to Mississippi without selling the piano. Before leaving, though, he reminds his sister to keep playing on...
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43 to 80 wpm Typically, professional typists type at speeds of 43 to 80 wpm, while some positions can require 80 to 95 (usually the minimum...
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Read More »When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the B♭ above middle C is approximately...
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Read More »In this type of system, each lock will still have its own key that corresponds with the wards; the skeleton key, or master key, can open any of the...
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