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  2. Whistling - Wikipedia

    en.wikipedia.org/wiki/Whistling

    An offstage whistle audible to the audience in the middle of a performance might also be considered bad luck. Transcendental whistling ( chángxiào 長嘯) was an ancient Chinese Daoist technique of resounding breath yoga, and skillful whistlers supposedly could summon supernatural beings, wild animals, and weather phenomena.

  3. Travel safety: 17 CIA tips, advice to think like a spy on ...

    www.aol.com/travel-safety-17-cia-tips-161432946.html

    Bags can disappear at the luggage carousel, the taxi stand, hotel lobby, or any number of other places. Story continues below. ... Carry an emergency whistle handy to scare off potential assailants.

  4. Physics of whistles - Wikipedia

    en.wikipedia.org/wiki/Physics_of_whistles

    A trailing edge tone occurs when an exterior flow passes over a trailing edge. There is a whistle that is a combination of an edge tone and a trailing-edge tone and might be called a wake-edge tone. It occurs in rotating circular saws under idling conditions and may be called the circular-saw whistle. Under load conditions, blade vibration ...

  5. Request stop - Wikipedia

    en.wikipedia.org/wiki/Request_stop

    A comparison showing the difference between a normal bus stop and a request stop in London. Wondabyne railway station is a request stop, located north of Sydney.. In public transport, a request stop, flag stop, or whistle stop is a stop or station at which buses or trains, respectively, stop only on request; that is, only if there are passengers or freight to be picked up or dropped off.

  6. Vehicle horn - Wikipedia

    en.wikipedia.org/wiki/Vehicle_horn

    Taxi horns for Gershwin's An American in Paris Various types of vehicle horns are used by percussionists as sound effects , or even melodically, in musical works. [ 10 ] For example, George Gershwin 's 1928 orchestral work An American in Paris calls for the use of 4 taxi horns. [ 11 ]

  7. Phreaking - Wikipedia

    en.wikipedia.org/wiki/Phreaking

    Phreaking began in the 1960s when it was discovered that certain whistles could replicate the 2600 Hz pitch used in phone signalling systems in the United States. [3] Phone phreaks experimented with dialing around the telephone network to understand how the phone system worked, engaging in activities such as listening to the pattern of tones to figure out how calls were routed, reading obscure ...

  8. Hand flute - Wikipedia

    en.wikipedia.org/wiki/Hand_flute

    It is also called a hand ocarina or hand whistle. To produce sound, the player creates a chamber of air with their hands, into which they blow air via an opening at the thumbs. To produce sound, the player creates a chamber of air with their hands, into which they blow air via an opening at the thumbs.

  9. What is the birthstone for December? Hint: There's actually ...

    www.aol.com/birthstone-december-hint-theres...

    Thanks to the many holidays that take place during December, the month is almost synonymous with gift-giving. For some, receiving presents can occur beyond these seasonal holidays, especially if ...