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WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [14] It allows users to send text, voice messages and video messages, [15] make voice and video calls, and share images, documents, user locations, and other content.
Hydrofluoric acid is a solution of hydrogen fluoride (HF) in water. Solutions of HF are colorless, acidic and highly corrosive. A common concentration is 49% (48-52%) but there are also stronger solutions (e.g. 70%) and pure HF has a boiling point near room temperature.
Nysa County ( Polish: powiat nyski) is a unit of territorial administration and local government ( powiat) in Opole Voivodeship, south-western Poland, on the Czech border. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and largest town is Nysa, which lies 48 ...
John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to as JFK, was an American politician who served as the 35th president of the United States from 1961 until his assassination in 1963. He was the youngest person elected president. [2] Kennedy served at the height of the Cold War, and the majority of his foreign policy ...
35% risk of death in first year [10] Heart failure ( HF ), also known as congestive heart failure ( CHF ), is a syndrome caused by an impairment in the heart's ability to fill with and pump blood. Although symptoms vary based on which side of the heart is affected, HF typically presents with shortness of breath, excessive fatigue, and bilateral ...
Due to strong and extensive hydrogen bonding, it boils at near room temperature, much higher than other hydrogen halides . Hydrogen fluoride is an extremely dangerous gas, forming corrosive and penetrating hydrofluoric acid upon contact with moisture. The gas can also cause blindness by rapid destruction of the corneas .
The High Frequency Global Communications System ( HFGCS) is a network of single sideband shortwave transmitters of the United States Air Force which is used to communicate with aircraft in flight, ground stations and some United States Navy surface assets. All worldwide receiving and transmitting sites in the HFGCS system are remotely ...
The Henry Jackson Society is a registered charity in England and Wales and receives financial backing from private donations and grant-making organisations which support its work. [70] The income of the Society increased significantly from 2009 to 2014, from £98,000 to £1.6 million per year.