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Gunpowder was the first known chemical explosive and propellant. Although largely obsolete in modern weaponry, gunpowder, also known as black powder, is still used in historical weapons, fireworks and pyrotechnics.

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The Neolithic Revolution led to farming. Farming allowed for the development of villages, then towns, then cities because a few people could feed the many. The Neolithic Revolution, there was minimal advancement in agriculture for centuries. But starting in the 18th and 19th centuries, there was another agricultural revolution.

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Columbus ¨discovers¨ the americas (1492)

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Columbus ¨discovers¨ the americas (1492)

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Columbus called all the people he met in the islands ‘Indians’, because he was sure that he had reached the Indies. This initial encounter opened up the 'New World' to European colonisation, which would come to have a devastating impact on indigenous populations. His voyages launched centuries of European exploration and colonisation of the American continents. His encounters also triggered centuries of exploitation of native American populations.

https://www.rmg.co.uk/stories/topics/christopher-columbus

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The Industrial Revolution is the process of changing from an economy dominated by agrarian (farming)  and handmade goods to one dominated by industry and machine manufacturing. This caused a boom in the population and lessened the need to have large numbers of people work the land to farm. With less people needed to farm, more moved to cities looking for manufacturing work.

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Plastics are man-made. They are created using fossil fuels. Plastics are a part of everyday modern life.

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The Green Revolution was the emergence of new varieties of crops, specifically wheat and rice varietals, that were able to double if not triple production of those crops in two countries. The green revolution led to high productivity of crops through adapted measures, such as increased area under farming, double-cropping, which includes planting two crops rather than one, adoption of HYV of seeds, highly increased use of inorganic fertilizers and pesticides.

https://www.frontiersin.org/journals/sustainable-food-systems

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Neil Armstrong steps onto the surface of the moon (1969)

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Neil Armstrong steps onto the surface of the moon (1969)

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American astronauts Neil Armstrong (1930-2012) and Edwin Buzz (1930-) became the first humans ever to land on the moon. About six-and-a-half hours later, Armstrong became the first person to walk on the moon.

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Syrians enraged by corruption and emboldened by a wave of "Arab Spring" protests across the region. The Syrian government used violence to suppress demonstrations, making extensive use of police, military, and paramilitary forces. The country is still mired in poverty and violence.