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Both the Mayans and the Babylonials had the idea of zero. The Mayans used it to make their calendars. A Hindu astronomer introduced the concept of zero as an independient number.

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The Assyrians created a special lens that could have been the first telescope.

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Egyptians made the first paper from the fiber of the papyrus plant and also invented a special pen to write on it.

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It was made of bronze an was very accurate in detecting earth movements.

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Romans created a really hard material by mixing rocks and volcanic ash.