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A cloaking device is a hypothetical or fictional stealth technology that can cause objects, such as spaceships or individuals, to be partially or wholly invisible to parts of the electromagnetic (EM) spectrum. Fictional cloaking devices have been used as plot devices in various media for many years. Developments in scientific research [ 1] show ...
[8] The network address it used at the time – facebookcorewwwi.onion – is a backronym that stands for Facebook's Core WWW Infrastructure. [ 7 ] In April 2016, it had been used by over 1 million people monthly, up from 525,000 in 2015. [ 3 ]
Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, [ 1] visible light, radio frequency (RF) spectrum, and audio, all collectively known as stealth technology. [ 2] The F-117 Nighthawk was the first operational aircraft explicitly designed around stealth technology.
The deep web, [ 1] invisible web, [ 2] or hidden web[ 3] are parts of the World Wide Web whose contents are not indexed by standard web search-engine programs. This is in contrast to the "surface web", which is accessible to anyone using the Internet. [ 4] Computer scientist Michael K. Bergman is credited with inventing the term in 2001 as a ...
Invisible ink. A coded letter from Benedict Arnold, originally written in invisible ink. Handwriting by Peggy Shippen Arnold is interspersed with coded communication in Arnold's hand. Invisible ink, also known as security ink or sympathetic ink, is a substance used for writing, which is invisible either on application or soon thereafter, and ...
Metamaterial cloaking is the usage of metamaterials in an invisibility cloak. This is accomplished by manipulating the paths traversed by light through a novel optical material. Metamaterials direct and control the propagation and transmission of specified parts of the light spectrum and demonstrate the potential to render an object seemingly ...
Spy pixel. Spy pixels or tracker pixels are hyperlinks to remote image files in HTML email messages that have the effect of spying on the person reading the email if the image is downloaded. [1] [2] They are commonly embedded in the HTML of an email as small, imperceptible, transparent graphic files. [3]
The same image viewed by white, blue, green, and red lights reveals different hidden numbers. Steganography (/ ˌ s t ɛ ɡ ə ˈ n ɒ ɡ r ə f i / ⓘ STEG-ə-NOG-rə-fee) is the practice of representing information within another message or physical object, in such a manner that the presence of the concealed information would not be evident to an unsuspecting person's examination.