Air purifier

An air purifier is a device which removes contaminants from the air in a room. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics, and at reducing or eliminating second-hand tobacco smoke. The commercially graded air purifiers are manufactured as either small stand-alone units or larger units that can be affixed to an air handler unit (AHU) or to an HVAC unit found in the medical, industrial, and commercial industries. Air purifiers may also be used in industry to remove impurities such as CO₂ from air before processing. Pressure swing adsorbers or other adsorption techniques are typically used for this.

Use and benefits of purifiers

Dust, pollen, pet dander, mold spores, and dust mite feces can act as allergens, triggering allergies in sensitive people. Smoke particles and volatile organic compounds (VOCs) can pose a risk to health. Exposure to various components such as VOCs increases the likelihood of experiencing symptoms of sick building syndrome. Additionally, with the advancement in air purification technology, air purifiers are becoming increasingly capable of capturing a greater number of bacterial, virus, and DNA damaging particulates. Air purifiers are used to reduce the concentration of these airborne contaminants and can be useful and wholesome for people who suffer from allergies and asthma.

Black operation

A black operation or black op is a covert operation by a government, a government agency, or a military organization. This can include activities by private companies or groups. Key features of a black operation are that it is secret and it is not attributable to the organization carrying it out. The main difference between a black operation and one that is merely secret is that a black operation involves a significant degree of deception, to conceal who is behind it or to make it appear that some other entity is responsible ("false flag" operations).

A single such activity may be called a "black bag operation"; that term is primarily used for covert or clandestine surreptitious entries into structures to obtain information for human intelligence operations. Such operations are known to have been carried out by the FBI, the Central Intelligence Agency,Mossad, MI6, ISI (Pakistan), RAW, MSS, and the intelligence services of other nations.

Etymology

"Black" may be used as a generic term for any government activity that is hidden or secret. For example, some activities by military and intel agencies are funded by a classified "black budget," of which the details, and sometimes even the total, are hidden from the public and from most congressional oversight.

Call of Duty: Black Ops III

Call of Duty: Black Ops III is a military science fiction first-person shooter video game, developed by Treyarch and published by Activision. It is the twelfth entry in the Call of Duty series and the sequel to the 2012 video game Call of Duty: Black Ops II. It was released on Microsoft Windows, PlayStation 4, and Xbox One on November 6, 2015. A feature-limited version developed by Beenox and Mercenary Technology that only supports multiplayer modes was released on PlayStation 3 and Xbox 360. Upon release, the game received positive reviews from critics and was a commercial success.

Plot

Single-player campaign

Setting and characters

Call of Duty: Black Ops III takes place in 2065, 40 years after the events of Black Ops II, in a world facing upheaval from climate change and new technologies. In response to the drone assaults of Black Ops 2, several countries around the world have developed high-tech air defenses that render conventional air forces virtually useless. As such, most of the warfare between countries is done by covert operatives fighting behind enemy lines. Military technology has progressed to the point where robotics play a major role in combat, and both fully robotic humanoid drones and cyborg supersoldiers have been developed to fight in the battlefield. As a result, there is speculation and fear about an eventual robotic takeover. The game follows a team of black ops soldiers, like previous installments in the Black Ops series.