Making contact with mercury, or similar heavy metals, is easy done in our environment. The possibilites come to us in the air, food, water, cosmetics, manufactured goods and endless other options, with the primary contributor being dentistry. Silver amalgam fillings are 50% mercury and have caused mercury poisoning in millions of people. Most dentist still deny the dangers.
The end of the video advertises a book which I have not read and am not attempting promote.