11 sept 3001 año aC - Abacus
Descripción:
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.Añadido al timeline:
fecha:
11 sept 3001 año aC
Ahora mismo
~ 5030 years ago