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  2. 4′33″ - Wikipedia

    en.wikipedia.org/wiki/4′33″

    4′33″. 4′33″[a] is a modernist composition [b] by American experimental composer John Cage. It was composed in 1952 for any instrument or combination of instruments; the score instructs performers not to play their instruments throughout the three movements. It is divided into three movements, [c] lasting 30 seconds, two minutes and 23 ...

  3. Repeater (horology) - Wikipedia

    en.wikipedia.org/wiki/Repeater_(horology)

    The decimal repeater works like the minute repeater, but instead of chiming the quarter hours followed by minutes, it sounds the number of ten-minute intervals after the last hour and then the minutes. For example, if the time is 2:49 then the decimal repeater will sound 2 low tones representing 2 hours, 4 sequence tones representing 40 minutes ...

  4. 4 Minutes - Wikipedia

    en.wikipedia.org/wiki/4_Minutes

    Music video. "4 Minutes" on YouTube. " 4 Minutes " is a song by American singer-songwriter Madonna from her eleventh studio album Hard Candy (2008), featuring vocals by fellow American singer-songwriter Justin Timberlake and American producer Timbaland. It was released as the lead single from the album on March 17, 2008, by Warner Bros. Records.

  5. Frequency - Wikipedia

    en.wikipedia.org/wiki/Frequency

    Frequency is an important parameter used in science and engineering to specify the rate of oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light. For example, if a heart beats at a frequency of 120 times per minute (2 hertz), the period—the interval between beats—is half a second ...

  6. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  7. Metronome - Wikipedia

    en.wikipedia.org/wiki/Metronome

    Metronome. A metronome (from Ancient Greek μέτρον (métron) 'measure' and νόμος (nómos) 'law') is a device that produces an audible click or other sound at a uniform interval that can be set by the user, typically in beats per minute (BPM). Metronomes may also include synchronized visual motion, such as a swinging pendulum or a ...

  8. Speed of sound - Wikipedia

    en.wikipedia.org/wiki/Speed_of_sound

    Speed of sound. The speed of sound is the distance travelled per unit of time by a sound wave as it propagates through an elastic medium. More simply, the speed of sound is how fast vibrations travel. At 20 °C (68 °F), the speed of sound in air is about 343 m/s (1,125 ft/s; 1,235 km/h; 767 mph; 667 kn), or 1 km in 2.91 s or one mile in 4.69 s.

  9. Dog Trainer Shares Common Misconception People Have About ...

    www.aol.com/lifestyle/dog-trainer-shares-common...

    Bronagh ends the video by reminding us that these dogs are showing signs of stress and fear responses in reaction to their pawrents behavior, not because they feel guilty. Pinned back ears, whale ...

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