    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.
Sail Cloth and Alternate Materials. There are a number of materials and cloths that you can use for making your sail. If you just want to go across the wind or down wind, about anything will work.If you want to sail into the wind, like at 60 degrees or less, then you will need a sail that has an air foil shape to it (which generates lift), and the material it is made out of should resist stretching.f you just want to go across the wind or down wind, about anything will work. If you want to sail into the wind, like at 60 degrees or less, then you will need a sail that has an air foil shape to it (which generates lift), and the material it is made out of should resist stretching.