The Magic Metal of Life - Calcium

Calcium could be called the "magic metal" of life. It is found throughout the body - 99% in our teeth and bones, and 1% in the form of ions in our cells. That 1% weighs only about 10 grams in total, but plays a crucial role in our bodies' basic functions. Did you know we depend on momentary shifts in the concentration of calcium ions in our cells for our muscles to contract, and neurons to transmit information? And that it all happens at lightning speed? What cellular process produces such changes in only half a second? Calcium is also intimately involved in the formation of new life. We explain the "calcium oscillations" that are fundamental to the process. Tune in to find out what role they, and other little-known activities of this magic metal, play in our bodies.
Trailer
Recently Updated Shows

Naked and Afraid: Last One Standing
Twelve of Naked and Afraid's toughest and most experienced all-stars take on South Africa's punishing Oribi Gorge in a completely new type of challenge. For the first time ever, survivalists will compete head-to-head through a grueling, multiphase challenge and have their primitive skills tested for the chance to win $100,000. The competition is fierce, as survivalists can use any means necessary - even sabotage - to take home the grand prize. At the end of 45 days, only one can be crowned the Last One Standing.

First Dates
The First Dates restaurant throws open its doors to single people looking for love.

Sister Wives
Sister Wives explores the complex daily life of a polygamist family. Sister Wives introduces audiences to husband Kody -- along with his three wives; Meri, Janelle and Christine and their combined 13 children -- showing how they attempt to navigate life as a "normal" family in a society that shuns their lifestyle. From their unconventional family structure and living arrangements to financial challenges, each half hour episode exposes the inner workings of a polygamist household, revealing the unexpectedly tight-knit and loving relationships between Kody's wives.