The academy can trace its earliest roots to the 1776 Continental Congress authorization of the establishment of a Corps of Invalids. This organization would give service to disabled officers with one its missions being to impart military knowledge to 'young gentlemen'.
A punctal plug is a very tiny, bio-compatible device that is inserted into the tear ducts to block drainage. Once inserted into the tear ducts, punctal plugs increase the eyeâs tear film and surface moisture to relieve dry eyes. No larger than a grain of rice, punctal plugs are also known as; punctum plugs, occluders, and lacrimal plugs. There are two types of punctal plugs: semi-permanent and dissolvable. Semi-permanent punctal plugs are typically made of long-lasting materials such as silicone; whereas dissolvable plugs are made of materials that eventually absorb such as collagen, and usually last from a few days to several months.
If you find this type of plug in you home it is time to call in an electrician. This is the electrical version of Beta vs VHS. This plug can fit both our parallel style plugs and Tandem plugs. The parallel style plugs are the type we use today. The un-grounded type like you would find on a lamp can still operate in an outlet like this. The Tandem style plug has two horizontal flat blades.