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1. The history of paper began in Ancient Egypt between 3,700 BC – 3,200 BC. They used papyrus for written records, which was a huge improvement over writing on clay tablets.
   
2. Paper recycling is the process of recovering waste paper and remaking it into new paper products.
   
3. There are three main sources of paper that can be used to make recycled paper. They are: Mill broke (which includes left over paper and trimming from the manufacture of paper), Pre-consumer waste (paper products that were thrown own before they were used by people), and Post-consumer waste (used paper materials such as magazines, newspapers, office trash, old phone books or directories).
   
4. In the mid 1900's paper was almost completely made from new wood pulp. It takes about 3 tons of trees to make one ton of paper if new wood pulp is used.

You can also visit TryEngineering.org to explore other activities and resources to explore engineering. Other activities and lessons can be found here.