sep 11, 3001 BC - Abacus
Description:
The Abacus was used in Babylon 2000 years before the Greeks used it to help with calculating. To use it, you slide the beads up and down on the rods to add and subtract. It is used today in some countries.Added to timeline:
Date:
sep 11, 3001 BC
Now
~ 5031 years ago