Nat Turner led a slave revolt several years before the Civil War. The revolt failed and he was killed. he is known for leading 2 uprises in Virginia in 1831 before getting caught.
Calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth most abundant element in Earthâs crust.
Calcium is the most abundant mineral in your body. It is essential for the development and maintenance of strong bones and teeth, where about 99% of the body's calcium is found.Calcium also helps the heart, nerves, muscles, and other body systems work properly. Calcium citrate: Easily absorbed and digested by the body. 2  It does not contain as much elemental calcium -- the amount your body actually absorbs -- as calcium carbonate. 3  It is more expensive than calcium carbonate. 4  Also, calcium citrate should not be used with aluminum-containing antacids.