Iranian Engineering Community commemorates "Engineers Day" on 24th February in memory of Khajeh Nasireddin Toosi one of the great scientist in Iran. Khajeh Nasireddin Toosi was born in Toos, Khorasan province, in 1201 AD and died in 1274 AD in Kazemain. Toosiwas one of the greatest scientists, philosophers, mathematicians, astronomers, theologians ...