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Tannerite
Tannerite is a brand of binary explosive targets used for firearms practice and sold in kit form. The targets comprise a combination of oxidizers and a fuel, primarily aluminium powder, that is supplied as two separate components that are mixed by the user. The combination is relatively stable when subjected to forces less severe than a high-velocity bullet impact. A hammer blow, the product being dropped, or impact from a low-velocity bullet or shotgun blast will not initiate a reaction. It is also designed to be non-flammable (the reaction cannot be triggered by a burning fuse or electricity), although its explosion can ignite flammable material. Because it is sold as separate components which are not themselves explosive, it is not regulated by the U.S. Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF), and can be transported and sold in many places without the legal restrictions that apply to explosives. The term ''tannerite'' is often used to refer to the mixture ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binary Explosive
A binary explosive or two-component explosive is an explosive consisting of two components, neither of which is explosive by itself, which have to be mixed in order to become explosive. Examples of common binary explosives include Oxyliquit (liquid oxygen/combustible powder), ANFO (ammonium nitrate/fuel oil), Kinestik (ammonium nitrate/nitromethane), Tannerite and ammonal (ammonium nitrate/aluminum), and FIXOR (nitroethane/physical sensitizer). Binary explosives are often used in commercial applications because of their greater handling safety. United States law In the United States, in states where a stricter rule is not in place (see below), ATF regulations allow the components of some binary explosives to be legally purchased, when neither one is an explosive by itself. ATF advises: "Persons manufacturing explosives for their own personal, non-business use only (e.g., personal target practice) are not required to have a Federal explosives license or permit." A prohibited pers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sawmill Fire (2017)
The Sawmill Fire was a wildfire that burned in the U.S. state of Arizona in April 2017. The fire was caused by the detonation of a target packed with Tannerite at a gender reveal party in the Coronado National Forest. No injuries or fatalities resulted from the fire, nor were any buildings destroyed, though the fire did come close to the historic Empire Ranch, a National Register of Historic Places property. Over 800 personnel from various federal, state, and local agencies and organizations worked to contain and then extinguish the Sawmill Fire at a cost of $8,200,000. The fire was started by accident on April 23, 2017, by Dennis Dickey, an off-duty U.S. Border Patrol agent who had shot the Tannerite target. Dickey immediately informed first responders of the fire, which spread rapidly until it was contained on April 30. The U.S. Attorney's Office charged Dickey with a misdemeanor charge to which he pleaded guilty, fined him $220,000 in restitution, and sentenced him to five ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gender Reveal
A gender reveal party is a party held during pregnancy to reveal the baby's sex to the expectant parents' family and friends, and sometimes to the parents themselves. Prenatal sex discernment technology furnishes the necessary information. The practice originated in the United States during the late 2000s. It is distinct from, but sometimes combined with, a baby shower, where the primary activity is giving expecting parents gifts for their future child. The gender reveal party often involves gender stereotypes such as Gendered associations of pink and blue, pink and blue denoting girls and boys, respectively. The practice is controversial and has been criticized for the use of elaborate and dangerous special effects, which have directly contributed to multiple deaths, injuries and large-scale forest fires, namely the Sawmill Fire (2017), 2017 Sawmill Fire and the El Dorado Fire, 2020 El Dorado Fire. The practice has also been criticized for reinforcing gender stereotypes, and G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gender Reveal Party
A gender reveal party is a party held during pregnancy to reveal the baby's sex to the expectant parents' family and friends, and sometimes to the parents themselves. Prenatal sex discernment technology furnishes the necessary information. The practice originated in the United States during the late 2000s. It is distinct from, but sometimes combined with, a baby shower, where the primary activity is giving expecting parents gifts for their future child. The gender reveal party often involves gender stereotypes such as pink and blue denoting girls and boys, respectively. The practice is controversial and has been criticized for the use of elaborate and dangerous special effects, which have directly contributed to multiple deaths, injuries and large-scale forest fires, namely the 2017 Sawmill Fire and the 2020 El Dorado Fire. The practice has also been criticized for reinforcing gender stereotypes, and binary gender essentialism. History and development The gender reveal pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonal
Ammonal is an explosive made up of ammonium nitrate and aluminium powder, not to be confused with T-ammonal which contains trinitrotoluene as well to increase properties such as brisance. The mixture is often referred to as Tannerite, which is a brand of ammonal. The ammonium nitrate functions as an oxidizer and the aluminium as fuel. The use of the relatively cheap ammonium nitrate and aluminium makes it a replacement for pure TNT. The mixture is affected by humidity because ammonium nitrate is highly hygroscopic. Ammonal's ease of detonation depends on fuel and oxidizer ratios, 95:5 ammonium nitrate and aluminum being fairly sensitive, however not very oxygen balanced. Even copper metal traces are known to sensitize bulk amounts of ammonium nitrate and further increase danger of spontaneous detonation during a fire, most likely due to the formation of tetramines. More oxygen balanced mixtures are not easily detonated, requiring a fairly substantial shock, though it remains ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2016 New York And New Jersey Bombings
On September 17–19, 2016, three bombs exploded and several unexploded ones were found in the New York metropolitan area. The bombings left 31 people wounded, but no fatalities or life-threatening injuries were reported. On the morning of September 17, a pipe bomb exploded in Seaside Park, New Jersey. Later that day, a homemade pressure cooker bomb went off in the Chelsea neighborhood of Manhattan, New York City. A second pressure cooker bomb was discovered four blocks away. Late on September 18, multiple bombs were discovered at the train station in Elizabeth, New Jersey. One of these bombs detonated early the next day. On September 19, 2016, the sole suspect—Ahmad Khan Rahimi, of Elizabeth—was captured, following a shootout with police in neighboring Linden, New Jersey, which left three officers injured. Rahimi was not part of a terrorist group, but his actions were believed to have been influenced by the extremist Islamic ideology espoused by al-Qaeda. In 2017, Rahim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
City
A city is a human settlement of notable size.Goodall, B. (1987) ''The Penguin Dictionary of Human Geography''. London: Penguin.Kuper, A. and Kuper, J., eds (1996) ''The Social Science Encyclopedia''. 2nd edition. London: Routledge. It can be defined as a permanent and densely settled place with administratively defined boundaries whose members work primarily on non-agricultural tasks. Cities generally have extensive systems for housing, transportation, sanitation, utilities, land use, production of goods, and communication. Their density facilitates interaction between people, government organisations and businesses, sometimes benefiting different parties in the process, such as improving efficiency of goods and service distribution. Historically, city-dwellers have been a small proportion of humanity overall, but following two centuries of unprecedented and rapid urbanization, more than half of the world population now lives in cities, which has had profound consequences for g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tucson, Arizona
, "(at the) base of the black ill , nicknames = "The Old Pueblo", "Optics Valley", "America's biggest small town" , image_map = , mapsize = 260px , map_caption = Interactive map outlining Tucson , image_map1 = File:Pima County Incorporated and Unincorporated areas Tucson highlighted.svg , mapsize1 = 250px , map_caption1 = Location within Pima County , pushpin_label = Tucson , pushpin_map = USA Arizona#USA , pushpin_map_caption = Location within Arizona##Location within the United States , subdivision_type = Country , subdivision_type1 = State , subdivision_type2 = County , subdivision_name = United States , subdivision_name1 = Arizona , subdivision_name2 = Pima , established_title = Founded , established_date = August 20, 1775 , established_title1 = Incorporated , e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tympanic Membrane
In the anatomy of humans and various other tetrapods, the eardrum, also called the tympanic membrane or myringa, is a thin, cone-shaped membrane that separates the external ear from the middle ear. Its function is to transmit sound from the air to the ossicles inside the middle ear, and then to the oval window in the fluid-filled cochlea. Hence, it ultimately converts and amplifies vibration in the air to vibration in cochlear fluid. The malleus bone bridges the gap between the eardrum and the other ossicles. Rupture or perforation of the eardrum can lead to conductive hearing loss. Collapse or retraction of the eardrum can cause conductive hearing loss or cholesteatoma. Structure Orientation and relations The tympanic membrane is oriented obliquely in the anteroposterior, mediolateral, and superoinferior planes. Consequently, its superoposterior end lies lateral to its anteroinferior end. Anatomically, it relates superiorly to the middle cranial fossa, posteriorly to the o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scientific American
''Scientific American'', informally abbreviated ''SciAm'' or sometimes ''SA'', is an American popular science magazine. Many famous scientists, including Albert Einstein and Nikola Tesla, have contributed articles to it. In print since 1845, it is the oldest continuously published magazine in the United States. ''Scientific American'' is owned by Springer Nature, which in turn is a subsidiary of Holtzbrinck Publishing Group. History ''Scientific American'' was founded by inventor and publisher Rufus Porter (painter), Rufus Porter in 1845 as a four-page weekly newspaper. The first issue of the large format newspaper was released August 28, 1845. Throughout its early years, much emphasis was placed on reports of what was going on at the United States Patent and Trademark Office, U.S. Patent Office. It also reported on a broad range of inventions including perpetual motion machines, an 1860 device for buoying vessels by Abraham Lincoln, and the universal joint which now can be found ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Detonator
A detonator, frequently a blasting cap, is a device used to trigger an explosive device. Detonators can be chemically, mechanically, or electrically initiated, the last two being the most common. The commercial use of explosives uses electrical detonators or the capped fuse which is a length of safety fuse to which an ordinary detonator has been joined. Many detonators' primary explosive is a material called ASA compound. This compound is formed from lead azide, lead styphnate and aluminium and is pressed into place above the base charge, usually TNT or tetryl in military detonators and PETN in commercial detonators. Other materials such as DDNP (diazo dinitro phenol) are also used as the primary charge to reduce the amount of lead emitted into the atmosphere by mining and quarrying operations. Old detonators used mercury fulminate as the primary, often mixed with potassium chlorate to yield better performance. A blasting cap is a small sensitive primary explosive device ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hexamethylene Triperoxide Diamine
Hexamethylene triperoxide diamine (HMTD) is a high explosive organic compound. HMTD is an organic peroxide, a heterocyclic compound with a cage-like structure. It is a Explosive material, primary explosive. It has been considered as an initiating explosive for Detonator, blasting caps in the early part of 20th century, mostly because of its high initiating power (higher than that of Mercury(II) fulminate, mercury fulminate) and its inexpensive production. As such, it was quickly taken up as a primary explosive in mining applications. However, it has since been superseded by more (chemically) stable compounds such as dextrinated Lead(II) azide, lead azide and DDNP (which contains no lead or mercury). HMTD is widely used in amateur-made blasting caps. Preparation and structure First synthesised in 1885 by the German chemist Ludwig Legler, HMTD may be prepared by the reaction of an aqueous solution of hydrogen peroxide and hexamine in the presence of an acid catalyst, such as citric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
