The four great inventions (四大发明) are inventions from ancient China that are celebrated for their historical significant achievement in Chinese culture and as a symbol of advanced science and technology in China.
1.Paper making
The earliest form of Chinese characters was inscriptions on oracle bones, followed by inscriptions on ancient bronze objects, and writing on silks. The invention that created by Cai Lun greatly contributed to the spread and development of civilization.
2.Gunpowder
Gunpowder was first invented by alchemists while attempting to make elixir or immorality. It was a mixture of saltpeter, sulphur and charcoal. It was being used in Tang dynasty for military affairs.
3.Compass
According to the basis of southward-pointing cart, the Chinese people invented a compass in the warring state period and later applied it to sea explorations and wars.
4.Printing Techniques
Inspired by engraved name seals, Chinese people invented fixed-type engraved printing around 600 A.D. The skill played an important role in the Song Dynasty but its shortcomings were apparent. It was time-consuming to engrave a model, not easy to store, and not easy to revise errors.
http://en.wikipedia.org/wiki/Four_Great_Inventions
http://www.travelchinaguide.com/intro/focus/inventions.htmhttp://www.chinahighlights.com/travelguide/culture/four-great-invention.htm
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