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.
In 1650, Otto von Guericke invented the air pump, used to create a partial vacuum. Using hollow copper spheres and an air pump of his own construction, Guericke demonstrated that a partial vacuum could be created by pumping the air out of the sphere.
Invented by : Otto Von Guericke. Invented in year : 1650. Air Pump is a device that removes gas molecules from a sealed volume or a chamber in order to leave behind a partial vacuum. By removing gas from a chamber, a vacuum pump reduces the pressure inside the chamber.