IBM quits facial recognition, joins call for police reforms
IBM is getting out of the facial recognition business, saying it's concerned about how the technology can be used for mass surveillance and racial profiling.
Jun 9, 2020
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Security
IBM is getting out of the facial recognition business, saying it's concerned about how the technology can be used for mass surveillance and racial profiling.
Jun 9, 2020
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Business
"Sharing economy" firms like Uber and Airbnb were seeing surging growth and predictions they would reshape several economic sectors. Then the pandemic hit.
May 13, 2020
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Internet
The late Harvard sociologist Daniel Bell long ago predicted the coming of the "information society," which he said would soon replace industrial society. Bell foresaw scientific experts driving government policy, services ...
May 11, 2020
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Internet
People find it convenient to use Facebook or other social media accounts to sign up for most new apps and services, but they prefer to use their e-mail address or open a new account if they feel the information in the app ...
Apr 25, 2020
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Business
Microsoft said Friday it is pulling its investments from a facial-recognition startup that scans faces at Israeli military checkpoints, even though the tech giant couldn't substantiate claims that the startup's technology ...
Mar 27, 2020
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Automotive
Despite Los Angeles County's legendary traffic jams, residents remain wedded to their cars and reluctant to use public transportation due to concerns over safety and convenience, according to the new USC Dornsife/Union Bank ...
Feb 20, 2020
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Business
President Donald Trump weighed in Wednesday on Apple's dispute with the US government over giving law enforcement access to encrypted iPhones, saying the company "has to help."
Jan 22, 2020
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Business
Apple and the US government are at loggerheads for the second time in four years over unlocking iPhones connected to a mass shooting, reviving debate over law enforcement access to encrypted devices.
Jan 14, 2020
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Automotive
In the not-too-distant future you could ride one, two or three wheels... or maybe none at all.
Jan 10, 2020
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Business
Microsoft is hiring former U.S. Attorney General Eric Holder to review its investment in a facial recognition startup that scans faces at Israeli military checkpoints.
Nov 16, 2019
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Mass can be defined as a quantitive measure of the resistance an object has to change in its velocity. In physics, mass (from Ancient Greek: μᾶζα) commonly refers to any of the following three properties of matter, which have been shown experimentally to be equivalent:
Mass must be distinguished from matter in physics, because matter is a poorly-defined concept, and although all types of agreed-upon matter exhibit mass, it is also the case that many types of energy which are not matter—such as potential energy, kinetic energy, and trapped electromagnetic radiation (photons)—also exhibit mass. Thus, all matter has the property of mass, but not all mass is associated with identifiable matter.
In everyday usage, "mass" is often used interchangeably with weight, and the units of weight are often taken to be kilograms (for instance, a person may state that their weight is 75kg). In scientific use, however, the two terms refer to different, yet related, properties of matter. Weight can be zero if no gravitational force is acting but mass can never be zero.
The inertial mass of an object determines its acceleration in the presence of an applied force. According to Newton's second law of motion, if a body of fixed mass M is subjected to a force F, its acceleration α is given by F/M.
A body's mass also determines the degree to which it generates or is affected by a gravitational field. If a first body of mass MA is placed at a distance r from a second body of mass MB, each body experiences an attractive force F whose magnitude is
where G is the universal constant of gravitation, equal to 6.67×10−11 N m2kg-2. This is sometimes referred to as gravitational mass (when a distinction is necessary, M is used to denote the active gravitational mass and m the passive gravitational mass). Repeated experiments since the 17th century have demonstrated that inertial and gravitational mass are equivalent; this is entailed in the equivalence principle of general relativity.
Special relativity shows that rest mass (or invariant mass) and rest energy are essentially equivalent, via the well-known relationship (E=mc2). This same equation also connects relativistic mass and "relativistic energy" (total system energy). These are concepts that are related to their "rest" counterparts, but they do not have the same value, in systems where there is a net momentum. In order to deduce any of these four quantities from any of the others, in any system which has a net momentum, an equation that takes momentum into account is needed.
Mass (so long as the type and definition of mass is agreed upon) is a conserved quantity over time. From the viewpoint of any single unaccelerated observer, mass can neither be created or destroyed, and special relativity does not change this understanding (though different observers may not agree on how much mass is present, all agree that the amount does not change over time). However, relativity adds the fact that all types of energy have an associated mass, and this mass is added to systems when energy is added, and the associated mass is subtracted from systems when the energy leaves. In such cases, the energy leaving or entering the system carries the added or missing mass with it, since this energy itself has mass. Thus, mass remains conserved when the location of all mass is taken into account.
On the surface of the Earth, the weight W of an object is related to its mass m by
where g is the Earth's gravitational field strength, equal to about 9.81 m s−2. An object's weight depends on its environment, while its mass does not: an object with a mass of 50 kilograms weighs 491 newtons on the surface of the Earth; on the surface of the Moon, the same object still has a mass of 50 kilograms but weighs only 81.5 newtons.
This text uses material from Wikipedia, licensed under CC BY-SA