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Qi is the Chinese word for energy. It literally translates to life force or breath.
The discovery of Qi is attributed to the first Chinese Emperor Fu Xi, who coincidentally also created the concepts of Yin and Yang, Heaven, Man, and Earth, and other cornerstones of classical Chinese theory. The concept of Qi as the universal particle dates back 6000 years.
Qi makes everything. The universe of our senses is comprised of Qi that is woven together to make large enough structures that we can perceive.