Wondering if the post office is open on Labor Day, and if the letter carrier will deliver the mail on Monday? Although most retail stores and restaurants will be open on September 7, the U.S. Postal Service will be closed. According to the U.S. Office of Personnel Management, the federal holiday is observed on Monday, and most government offices, including the USPS, will be closed all day.
The organophosphate nerve agents tabun (GA), sarin (GB), soman (GD), and cyclosarin (GF) are among the most toxic chemical warfare agents known. Together they comprise the G-series nerve agents, thus named because German scientists first synthesized them, beginning with GA in 1936. GB was discovered next in 1938, followed by GD in 1944 and finally the more obscure GF in 1949. The only other known nerve agent, O-ethyl S-(2-diisopropylaminoethyl) methylphosphonothioate (VX), is discussed in a separate article of this journal (see CBRNE-Nerve Agents, V-series-Ve, Vg, Vm, Vx). G-series nerve agents share a number of common physical and chemical properties. At room temperature, the G-series nerve agents are volatile liquids, making them a serious risk for 2 types of exposure: dermal contact with liquid nerve agent or inhalation of nerve agent vapor.
There are several ways to treat epilepsy. How well each treatment works varies from one person to another. Vagus nerve stimulation therapy is a form of treatment for people with epilepsy whose seizures are not controlled with medication. What are the vagus nerves? The vagus nerves are a pair of nerves that start in the brain and run through the body. They send and receive messages between the brain and the body. What is VNS therapy and how does it work? Vagus nerve stimulation (VNS) therapy is a type of treatment for epilepsy that involves a stimulator (or 'pulse generator') which is connected, inside the body, to the left vagus nerve in the neck. The stimulator sends regular, mild electrical stimulations through this nerve to help calm down the irregular electrical brain activity that leads to seizures.