Bună . Am de tradus următorul text : About 300 BC the Egyptians were already skilled architects and builders . Stones wighing more than 15 tones were worked with copper tools . Their temples show how vast blocks of stone had to pulled on sledges by gangs of men. Ramps were built and the blocks were pulled up these,again by gangs of men. It was the Egyptians who discovered some of the first principles of the world, such as the pyramids.They were the first hyfraulic engineers by their pipes and canals as well as poineers in the manufacture of glass,brick and pottery . The first counting machine arrived when the stones used previously were replaced by beads threaded on wire. This machine , called an abacus, is still in use todai . As painting and urinting developed , simbols were used to repesent numbers of things and in mani countries the simbol for one became a drawing of an upright finger. At first mani drawings were needed to repesent large nembres , until somewhere in India a new sistem developed using onli ten simbols . Among these was the simbol for zero . This Hindu Arabic system is the one we use today thouhs the drawings have been simplified so that they appear as 0123456789 . The romans wrked out our present calendar nearly 2,000 years ago . They based it on the movements of the Earth around the Sun and the Moon around the Earth . They gave a solution to the adjustment of the sideral year to the solar .