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mind map by Mind Map: mind map

1. The number zero: This number is somewhat new in human history. Both the Mayans and the Babylonians had the idea of zero

2. Paper: Around 3,000 BC, Egyptians made the first paper from the fiber of the papyrus plant and also invented a special pen to write on it.

3. Earthquake detector: The Chinese invented the first seismograph 2,000 years ago.

4. Concrete: About 2,100 years ago, Romans created a really hard material by mixing rocks with volcanic ash.

5. Believe it or not, people that lived many years ago invented things that are still used nowadays.

6. Discoveries from Ancient Cultures

7. Telescope: The Assyrians could see the stars and the sky 3,000 years ago