    Ð°Ð½ Obstetrician is a physician who has successfully completed specialized education and training in the management of pregnancy, labor, and the puerperium (the t â¦ ime-period directly following childbirth).n Obstetrician specializes in the care and treatment of pregnant women during their pregnancy, labor, delivery and the postpartum period.
Animal skins were used as sails for the earliest boats and rafts. The Egyptians and other ancient people wove reeds together in mats to make sails, but the Egyptians were also the first to make cloth sails as early as 3300 B.C. Great sailors of the Mediterranean region like the Phoenicians sailed under cloth sails.
Triangular Rigged Ships. The triangular sail was known as the lateen sail, and has been used in Arab ships from Morocco to Indian, the Persian Gulf to Mozambique. This sail is triangular in shape attached fore and aft, and is very tall and high peaked. In the Indian Ocean the fore angle of the sail was cut off to form a luff. This shape may have been the third of four stages of the evolution of lateen sail. Apparently most very ancient ships simply used square sails.