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.
1. The Shuttle killed more people than any other space vehicle in history. The explosion of the Challenger killed seven people, six astronauts and one Teacher in Space participant, during the launch of its 10 th mission in 1986. The explosion of the Columbia killed seven more during re-entry of its 28 th mission in 2003. Let me spell it out for you: out of five ShuttlesâColumbia, Challenger, Discovery, Atlantis, and Endeavorâtwo met a disastrous and fiery fate. Thatâs a 40% vehicular failure rate (updated) and a flight failure rate of 1.5%.