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With the navigational aid of the 11th century compass and ability to steer at high sea with the 1st century sternpost rudder, premodern Chinese sailors sailed as far as East Africa.
A Korean miniature dharani Buddhist sutra discovered in 1966, bearing extinct Chinese writing characters used only during the reign of China's only self-ruling empress, Wu Zetian (r.690–705), is dated no earlier than 704 and preserved in a Silla Korean temple stupa built in 751.
It was completed in 1412, a long while after Liu's death, with a preface added by the Jiao in its Nanyang publication.
Although an ancient hematite artifact from the Olmec era in Mexico dating to roughly 1000 BC indicates the possible use of the lodestone compass long before it was described in China, the Olmecs did not have iron which the Chinese would discover could be magnetised by contact with lodestone.
The first printed periodical, the Kaiyuan Za Bao was made available in AD 713.
However, the earliest known book printed at regular size is the Diamond Sutra made during the Tang Dynasty (618–907), a 5.18 m (17 ft) long scroll which bears the date 868 AD.