Binocular parallax, the apparent difference in position of an object as seen separately by one eye, and then by the other, the head remaining unmoved. Here is another way to understand what parallax is and what causes it. With one eye closed hold your thumb out in front of your open eye and put your thumb on top of a distant object. Now close the eye you are looking through and open the other eye while you hold your thumb steady on target.
Tea is nearly 5,000 years old and was discovered, as legend has it, in 2737 b.c. According to legend, the Shen Nong (or Shen Nung) , an early emperor was a skilled ruler, creative scientist and patron of the arts. He was called The Divine Healer. Numerous other medicinal plants were attributed to this legendary emperor.
In the beginning, tea was used in ritual offerings. Then, tea leaves were eaten as a vegetable, or used in medicine. Until the Han Dynasty more than 2,000 years ago, tea was a new drink. During the Sui Dynasty (581-618), tea was used for its medicinal qualities.In the fourth and fifth centuries, rice, salt, spices, ginger and orange peel, among other ingredients, were added to tea.In the Tang Dynasty (618-907), tea drinking became an art form and a drink enjoyed by all social classes.hennong (Chinese: ç¥å), whose name means the Divine Farmer -- and who is considered as the ancient Chinese Father of Agriculture, is honored with the discovery of tea.