Although calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO).lthough calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO).
Jim Plunkett. Jim Plunkett (born December 5, 1947) is a former American football quarterback who played college football for Stanford University, where he won the Heisman Trophy, and professionally for three National Football League teams: the New England Patriots, San Francisco 49ers and Oakland/Los Angeles Raiders.
Laurent Clerc was the first deaf person to stand before congress, as well as the President of the United States. His best left impression on today is that about fifty-eight percent of American sign language, came from Laurent Clerc's teachings. (l.c.n.d.e.c) There are many programs today that help people that are deaf with schooling, treatment and life's activities.