Cai Mao was a very skilled warrior under Liu Biao, the governor of the Jing province in China during the end of the Han dynasty. When Liu Biao's rule was passed onto Liu Zong he convinced him to surrender to Cao Cao. He also was a gifted naval commander. Liu Biao (?- 208 AD) was the governor of the Jing province in China towards the end of the Han dynasty. ... Han commanderies and kingdoms AD 2. ...
Sand cays are formed when tidal action, wind and sea birds deposits, over a long period ot time, coral debris and sand on to reef flats, usually on the leeward side of the reef, but occasionally on the windward side.
Cai's contribution is considered one of the most important inventions in history, since it enabled China to develop its civilization much faster than with earlier writing materials (primarily bamboo), and it did the same with Europe when it was introduced in the 12th century or the 13th century.