Daily Extra :
Astronomy & Space Word of The Day
convection: The transfer of heat from a region of high temperature to a region of lower temperature by the displacement of the cooler molecules by the warmer molecules.
Today in History:
1970: Apollo 13 - USA Lunar Flyby (April 11-17, 1970) Crew: James A. Lovell, Jr., Fred W. Haise, Jr., John L. Swigert, Jr. The Apollo 13 mission became one of survival for the astronauts on board. During the translunar coast an explosion destroyed both power and propulsion systems of the Command Service Module. The Lunar Module was used as a lifeboat for the astronauts.
1961: Major Yuri Gagarin became the first man in space.