____ of the past century changed the world. For example, Archimedes invented the ____. Researchers found some new fossils, and now they are working on them in the ____. Newton discovered the ____ and now scientists are exploring the solar gravity. James Watt invented the ____, and this gave rise to locomotives, steamships, and even the first automobiles. The machine devised by the German Gutenberg, led to the spread of ideas, knowledge and literacy. There are a lot of scientific achievements that affect our world. Even now, we can learn, teach, and talk about them.

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