Dating system used bc carbometric dating dinosaur

These are paper, gunpowder, the compass and printing.

Interestingly the word 'paper' is derived from 'papyrus'.

But it was an improvement over the materials previously used for writing on, like bone, wood and stone.

The invention of paper as we know it came in China around 105 AD.

One mistake could ruin the entire block, and once used the block became useless, because it was unique.

Not only was it expensive, but it was slow, and there was no guarantee each copy would be the same.

However recent archaeological evidence suggests paper was in use in China two hundred years earlier.

In any event China was way ahead of the rest of the world.

Around 2,200 BC the Egyptians in the lower Nile region discovered that a type of reed, papyrus, could be formed into a writing surface by overlapping thin strips which had been soaked for a long time in water, and then pounding and pressing it into a sheet.

But it wasn't really paper as we know it, and it was difficult to write on, and expensive.

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He made his paper by boiling up all the raw materials with wood ash or lime for up to 35 days.

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