Short-term disability insurance, which is most often purchased as part of a group at work, can be paid by either the employer or the employee. Group short-term disability insurance policies are guaranteed issue, meaning you do not have to take a medical exam to buy coverage.
Otto von Guericke: Father of Vacuums. Otto von Guericke was a German scientist born in the town of Magdeburg, Germany. He is best remembered for founding the physics of vacuums. In 1650, Otto invented a vacuum pump that was designed to pull air out of whatever vessel to which it was connected. It contained a piston and an air-gun cylinder with one-way flap valves.
The Cyanotype, which is also known as ferroprussiate or blueprint was invented by Sir John Herschel in 1842, when he discovered that ferric (iron) salts could be reduced to a ferrous state by light and then combined with other salts to create a blue-and-white image. cyanotype with a blue image on a white background is obtained using a negative transparency. In order to obtain a pale white image on a blue background, a positive transparency must be used. Cyanotypes are created with a simple solution of ferric ammonium citrate and potassium ferricyanide.