    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.
The Babylonians used wind power for irrigation during the 17th Century BC, 4th Century BC the classic work Sanskirt made reference a contraption that used the wind to lift water. The first documented windmill dates back to 200 BC made by the Persians to girding grain. These early windmills had a vertical access design with sails made out of reeds or wood and were usually x-xft (5-9m) tall.