Dr. Bruce Lipton, author of the Biology of Belief, explains how the your environment physically affects your cells, and by extension, your health. He further describes the difference between your conscious mind (which creates your wishes and desires) and the unconscious mind (which is responsibe for your behavior and is based on beliefs and past programming). He then explains how to change behavior through living in the moment to turn off past programming as well as creating new habits. Lastly, he tells us how to create heaven on Earth.
(Editor's note: Despite the subtitles, this video is well worth watching)