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.
About Black Tea (Known As Red Tea In China) Until the invention of Black Tea in the mid 17th century (Late Ming/Early Qing Dynasty), the majority of tea consumed in China for 2,500 years had been green un-fermented and later, semi-fermented teas.