Inventions

The invention of the ball-and-stick model.

definition The ball-and-stick model is a molecular model of a chemical substance in which both the three-dimensional position of the atoms and the bonds between them are displayed[1]. INVENTION The German chemist August Wilhelm von Hofmann invented[2] the ball-and-stick model in 1865 in order to better explain the molecular makeup of chemical substances. Initially, he …

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The invention of the multistage rocket.

definition A multistage rocket is a vehicle having two or more rocket units, each operating in turn once its propellant has been exhausted. INVENTION The Chinese philosophers and military strategists Jiao Yu and Liu Ji invented[1] the multistage rocket circa 1350. Here is a description of their multistage rocket which they termed as “fire-dragon issuing …

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