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 experiment was performed in 1657 at Magdeburg, Germany by Otto von Guericke (1602-1686), the Burgomeister (mayor) of Magdeburg. The hemispheres were made of bronze and were about 1.2 feet across. Von Guericke calculated that a force of almost 2700 pounds would be needed to pull the two hemispheres apart.Directly below is a picture of the original hemispheres in the Deutches Museum in Munich.ost physicists have seen the woodcut at the right, in which eight horses on the right and eight horses on the left are trying to pull apart two evacuated hemispheres.