Your gadget's next power supply? Your body
Searching for a power outlet may soon become a thing of the past.
Feb 9, 2018
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Searching for a power outlet may soon become a thing of the past.
Feb 9, 2018
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62
From sample preparation to image acquisition, electron microscopy (EM) requires precise and time-consuming steps to produce the clarity and detail needed to visualize small cell structures with high resolution. Moreover, ...
Apr 20, 2021
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Bitcoin's rally above $15,000 has reignited debate over whether the cryptocurrency is so-called digital gold or a perilously risky bet as investors grapple with the coronavirus pandemic.
Nov 8, 2020
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The head of Italy's privacy watchdog was hopeful Tuesday that OpenAI would adjust its AI chatbot so it could be back online in the country at the end of April.
Apr 18, 2023
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Microsoft is fusing ChatGPT-like technology into its search engine Bing, transforming an internet service that now trails far behind Google into a new way of communicating with artificial intelligence.
Feb 7, 2023
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An eSports final at the Southeast Asian Games has been rocked by cheating allegations that led to the gold medal being shared between two countries on Thursday.
May 11, 2023
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From the moment news broke of an unknown, potentially deadly virus, the topic lit up social media channels—creating a trove of data for the University of Toronto's Jia Xue, who uses computational approaches to study social ...
Jul 22, 2020
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Early diagnosis of cancer greatly improves the odds of successful treatment. Yet many people, especially in developing countries, lack access to facilities to detect the disease.
Oct 4, 2018
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Global leaders should be working to reduce "the risk of extinction" from artificial intelligence technology, a group of industry chiefs and experts warned on Tuesday.
May 30, 2023
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In a cloud of gray dust, a heavy-duty excavator loads a truck with stone blocks containing lithium, the "white gold" of the clean-energy revolution, which some hope will transform this parched, impoverished region of Brazil.
Jun 15, 2023
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Gold (pronounced /ˈɡoʊld/) is a chemical element with the symbol Au (Latin: aurum) and an atomic number of 79. It has been a highly sought-after precious metal in jewelry, in sculpture, and for ornamentation since the beginning of recorded history. The metal occurs as nuggets or grains in rocks, in veins and in alluvial deposits. Gold is dense, soft, shiny and the most malleable and ductile pure metal known. Pure gold has a bright yellow color and luster traditionally considered attractive, which it maintains without oxidizing in air or water. It is one of the coinage metals and formed the basis for the gold standard used before the collapse of the Bretton Woods system in 1971.
At the end of 2006, it was estimated that all the gold ever mined totaled 158,000 tonnes. This can be represented by a cube with an edge length of just 20.2 meters. Modern industrial uses include dentistry and electronics, where gold has traditionally found use because of its good resistance to oxidative corrosion and excellent quality as a conductor of electricity. Chemically, gold is a transition metal and can form trivalent and univalent cations upon solvation. At STP it is attacked by aqua regia (a mixture of acids), forming chloroauric acid and by alkaline solutions of cyanide but not by single acids such as hydrochloric, nitric or sulfuric acids. Gold dissolves in mercury, forming amalgam alloys, but does not react with it. Since gold is insoluble in nitric acid which will dissolve silver and base metals, this is exploited as the basis of the gold refining technique known as "inquartation and parting". Nitric acid has long been used to confirm the presence of gold in items, and this is the origin of the colloquial term "acid test", referring to a gold standard test for genuine value.
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