|  | The Museum of Chinese Science and Technology on northern section of the 3rd Ring Road presents both permanent and short-term exhibitions. That on ancient Chinese technology, introducing astronomy, the compass, gunpowder, bronze smelting and casting, papermaking and printing, was a favorite in it time. 
 The displays of modern science and technology-electromagnetism, mechanics, heat, acoustics, optics, nuclear technology and information technology-are organized to encourage participation.
 
 (China.org.cn)
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