## Alhazen pretended madness to escape from Egypt RulerAlhazen is known as the "Father of Modern Optics, Experimental physics and scientific methodology" According to one version of his biography, overconfident about practical application of his mathematical knowledge, he assumed that he could regulate the floods of the Nile, a task requiring an early attempt at building a dam at the present site of the Aswan High Dam. ## AlhazenAlhazen (965 – 1040) was an Iraqi Muslim scientist, polymath, mathematician, astronomer and philosopher. He made significant contributions to the principles of optics, as well as to astronomy and mathematics.## Isis's tears of sorrowAncient Egyptians believed that the Nile flooded every year because of Isis's tears of sorrow for her dead husband, Osiris. Isis is an ancient Egyptian goddess and she was worshiped as the ideal mother and wife as well as the patroness of nature and magic. Osiris is an Egyptian god, usually identified as the god of the afterlife, the underworld and the dead.## Aswan High Dam in Nile – 3rd biggest in WorldThe Aswan High Dam is 3,830 metres (12,570 ft) long, 980 metres (3,220 ft) wide at the base, 40 metres (130 ft) wide at the crest and 111 metres (364 ft) tall. It contains 43,000,000 cubic metres (56,000,000 cu yd) of material. At maximum, 11,000 cubic metres per second (390,000 cu ft/s) of water can pass through the dam. There are further emergency spillways for an extra 5,000 cubic metres per second (180,000 cu ft/s). The reservoir, named Lake Nasser, is 550 kilometres (340 miles) long and 35 kilometres (22 miles) at its widest with a surface area of 5,250 square kilometres (2,030 sq miles). It holds 132 cubic kilometres of water. |