-
988
Perfect compas
A compass with one leg of a variable length that allows his users to draw any conic section straights line circles.. -
1151
Greek-fire
Greek fire was a substance made of napalm would burn objects in its path -
1377
Chinese priting
They invented printing and paper money. -
1482
Spanish discovered Incan numeric calculation
Incan used Quipu as tool to make numeric calculation