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@ -14,7 +14,7 @@ Around 50 AD Heron of Alexandria, an Egyptian mathematician, created a number of
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In the 3rd century Chinese mathematician Liu Hui describes operations with **negative numbers**, even though negative numbers have already appeared before. In 600s AD an Indian astronomer Brahmagupta first used the number **[zero](zero.md)** in a systematic way, even though hints on the number zero without deeper understanding of it appeared much earlier.
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Around 1450 a major technological leap known as the **Printing Revolution** occurred. Johannes Gutenberg, a German goldsmith, perfected the process of producing books in large quantities with the movable type press. This made books cheap to publish and buy and contributed to fast spread of information and better education.
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Around the year of our Lord 1450 a major technological leap known as the **Printing Revolution** occurred. Johannes Gutenberg, a German goldsmith, perfected the process of producing books in large quantities with the movable type press. This made books cheap to publish and buy and contributed to fast spread of information and better education.
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During 1700s a major shift in civilization occurred, called the **[Industrial Revolution](industrial_revolution.md)**. It spanned roughly from 1750 to 1850. It was a process of rapid change in the whole society due to new technological inventions that also led to great changes in how people worked and lived their everyday lives. It started in Great Britain but quickly spread over the whole world. One of the main changes was the **transition from manual manufacturing to factory manufacturing** using machines and sources of energy such as coal. **[Steam engine](steam_engine.md) played a key role**. Work became more organized, society became industrionalized. This revolution became [criticized](ted_kaczynski.md) as it unfortunately opened the door for [capitalism](capitalism.md), made people less independent as everyone had to become a specialized cog in the society machine, at this time people started to measure time in minutes and lead very planned lives. People became enslaved by the system.
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