Whistle and Whistleblower Day

Today is July 27, a holiday for many, and also, Whistling or Whistle and Whistleblower Day. A whistle, or whistling action, is the sound produced by expelling air through pursed lips with the occasional help of the fingers, usually high-pitched, although it can be relatively low-pitched and reach at least four octaves. The inside of the mouth acts as a sounding board and the modulation originates in the throat. In some Latin American countries and in parts of Andalusia it is called chiflido or chiflo. It has also been widely used to produce music.