Black Clay

The origins of barro negro pottery extend over centuries, with examples of it found at a number of archeological sites, fashioned mostly into jars and other utilitarian items. It has remained a traditional crafts of the Zapotecs and Mixtecs of the Central Valleys area to the present day.Originally barro negro pottery was matte and grayish. In this form, the pottery is very sturdy, allowing it to be hit without breaking. In the 1950s, a woman by the name of Doña Rosa Real discovered that she could change the color and shine of the pieces by polishing the clay pieces and firing them at a slightly lower temperature. Just before the formed clay piece is completely dry, it is polished with a quartz stone to compress the surface. After firing, the piece emerges a shiny black instead of a dull gray. This innovation makes the pieces more breakable, but it has made the pottery far more popular with Mexican folk art collectors, including Nelson Rockefeller, who promoted it in the United States.The popularity stems from the look, rather than wearability, so many pieces are produced now for decorative purposes rather than utilitarian.Doña Rosa died in 1980, but the tradition of making the pottery is being carried on by Doña Rosa’s daughter and grandchildren who stage demonstrations for tourists in their local potters' workshop.The workshop is still in the family home, where shelves and shelves of shiny black pieces for sale line the inner courtyard. Despite being the origin of black polished clay, pieces at this workshop are much cheaper than in other parts of Mexico.

Dead Sea

35 different types of minerals can be found in the Dead Sea's waters. This minerals have a lot of health qualities. The mineral salts are believed to cure or alleviate the symptoms from skin problems such as psoriasis and atopic dermatitis to rheumatic diseases, like various forms of arthritis.
 The Dead Sea Research Center proposes a seven-step treatment program for people serching dermatological relief. To begin, the patient spends some time in the sun on the banks of the Dead Sea. Then, the patient has to take a bath in the Dead Sea.
Then application of emollient creams, thermo-mineral baths and black mud, scalp treatment, optional psychological counseling and a follow-up consultation with a medical professional. 
 Thanks to its unbelievably high mineral content, the Dead Sea is incredibly dense. This high-density level allows people to float without any effort whatsoever -- they are able to read books or bob carelessly in the water.