Zhang Heng was an astronomer, mathematician, inventor and geographer.
His contributions left influence on China’s science and technology.
He invented the world’s first earthquake detection device, instrument for measuring seasonal winds and Earth’s movements.
He believed that earthquakes were caused by winds and air pressure changes. The tectonic theory, which explains how the earthquakes are caused, appeared in the early 20th century.
His device was limited to measuring the approximate location of the epicenter.
[Source: www.stdaily.com]
Idol Man 