The term âcatapultâ is used to define a very wide variety of large machines for hurling projectiles and some of the more common variations include the trebuchet, which is a catapult that uses gravity and a seesaw effect to hurl its projectile.
A demyelinating disease is any condition that results in damage to the protective covering (myelin sheath) that surrounds nerve fibers in your brain and spinal cord.
Freeze-dryingâtechnically known as lyophilisation, lyophilization, or cryodesiccationâis a dehydration process typically used to preserve a perishable material or make the material more convenient for transport.