heart murmur a sound additional to the normal heart sounds, heard on auscultation of the heart. Many murmurs are of no significance (innocent, physiological murmurs), particularly in young children, or due to increased blood flow through the heart during exercise, or in pregnancy.
Columbia Space Shuttle Disaster. On February 1, 2003, the space shuttle Columbia was returning from its 28th mission when, 16 minutes to touchdown, the shuttle incinerated and broke apart over Texas. Communication between the Columbia crew and Mission Control captures the last moments of the flight.
Space Shuttle: Was the crew of the Challenger conscious until the very end? A question about the 25th Space Shuttle Mission - STS 33 - 51-L that exploded 73 seconds after launch, on 28th January 1986, destroying orbiter OV-099 'Challenger'...