Speed of Sound
Sound can be described as a pressure disturbance that travels through the constituent particles of a medium: as one particle of the medium is perturbed by the pressure, it exerts a forc...
Read more
Today is Friday, April 20, the 110th day of 2007. There are 255 days left in the year.Today's Highlight in History:On April 20, 1999, the Columbine High School massacre took place in Littleton, Col...
Read more
Today is Monday, Oct. 15, the 288th day of 2007. There are 77 days left in the year.Today's Highlight in History:On Oct. 15, 1917, Dutch dancer Mata Hari, convicted of spying for the Germans, was e...
Read more
Pilot Scott Crossfield, the first man to fly at twice the speed of sound, and an air traffic controller were blamed Thursday for the crash of a single-engine plane during a thunderstorm last year t...
Read more
Today is Saturday, Oct. 13, the 286th day of 2007. There are 79 days left in the year.Today's Highlight in History:On Oct. 13, 1792, the cornerstone of the executive mansion, later known as the Whi...
Read more
An asteroid that exploded over Siberia a century ago, leaving 800 square miles of scorched or blown down trees, wasn't nearly as large as previously thought, a researcher concludes, suggesting a gr...
Read more
With "The Feminine Mystique," Betty Friedan gave rise to the modern women's movement, striking a chord that continues to ring four decades later.Friedan and Coretta Scott King gained fame as crusad...
Read more
With "The Feminine Mystique," Betty Friedan gave rise to the modern women's movement, striking a chord that continues to ring four decades later.Friedan and Coretta Scott King gained fame as crusad...
Read more
Speed of Sound
Today in history - April 20
