11 сент 3001 г. до нашей эры - Abacus
Описание:
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.Добавлено на ленту времени:
Дата:
11 сент 3001 г. до нашей эры
Сейчас
~ 5030 г назад