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π Obesity in US 1985-2006
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- "Obesity in US 1985-2006" | 2010-12-26 | 14 Upvotes 1 Comments
π A Roman road built in 312 BC, is still in use today
The Appian Way (Latin and Italian: Via Appia) is one of the earliest and strategically most important Roman roads of the ancient republic. It connected Rome to Brindisi, in southeast Italy. Its importance is indicated by its common name, recorded by Statius, of Appia longarum... regina viarum ("the Appian Way, the queen of the long roads").
The road is named after Appius Claudius Caecus, the Roman censor who began and completed the first section as a military road to the south in 312 BC during the Samnite Wars.
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- "A Roman road built in 312 BC, is still in use today" | 2022-10-16 | 31 Upvotes 6 Comments
π 1, 2, 4, 8, 16, 31
In geometry, the problem of dividing a circle into areas by means of an inscribed polygon with n sides in such a way as to maximise the number of areas created by the edges and diagonals, sometimes called Moser's circle problem, has a solution by an inductive method. The greatest possible number of regions, rG = (βn
4β) + (βn
2β) + 1, giving the sequence 1, 2, 4, 8, 16, 31, 57, 99, 163, 256, ... (OEIS:Β A000127). Though the first five terms match the geometric progression 2n β 1, it diverges at n = 6, showing the risk of generalising from only a few observations.
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- "1, 2, 4, 8, 16, 31" | 2021-04-25 | 40 Upvotes 5 Comments
π Patentleft
Patentleft (also patent left, copyleft-style patent license or open patent) is the practice of licensing patents (especially biological patents) for royalty-free use, on the condition that adopters license related improvements they develop under the same terms. Copyleft-style licensors seek "continuous growth of a universally accessible technology commons" from which they, and others, will benefit.
Patentleft is analogous to copyleft, a license which allows distribution of a copyrighted work and derived works, but only under the same or equivalent terms.
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- "Patentleft" | 2021-07-30 | 13 Upvotes 2 Comments
π Blohm and Voss BV 141
The Blohm & Voss BV 141 was a World War II German tactical reconnaissance aircraft. It is notable for its uncommon structural asymmetry. Although the Blohm & Voss BV 141 performed well, it was never ordered into full-scale production, for reasons that included the unavailability of the preferred engine and competition from another tactical reconnaissance aircraft, the Focke-Wulf Fw 189.
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- "Blohm and Voss BV 141" | 2020-04-12 | 27 Upvotes 5 Comments
π AI Effect
The AI effect is a phenomenon in which advances in artificial intelligence lead to a redefinition of what is considered intelligence, such that capabilities achieved by AI systems are no longer regarded as examples of "real" intelligence.
The concept has been used to describe both a cognitive tendency and a sociotechnical pattern, in which successful AI techniques are reclassified as routine computation or absorbed into other domains.
Historian Pamela McCorduck described this as a recurring feature of AI research, noting that once a problem is solved, it is no longer considered evidence of intelligence. Researcher Rodney Brooks similarly observed that once systems are understood, they are often regarded as "just computation".
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- "AI Effect" | 2025-09-02 | 12 Upvotes 1 Comments
π One-Way Speed of Light
When using the term 'the speed of light' it is sometimes necessary to make the distinction between its one-way speed and its two-way speed. The "one-way" speed of light, from a source to a detector, cannot be measured independently of a convention as to how to synchronize the clocks at the source and the detector. What can however be experimentally measured is the round-trip speed (or "two-way" speed of light) from the source to a mirror (or other method of reflection) and back again to detector. Albert Einstein chose a synchronization convention (see Einstein synchronization) that made the one-way speed equal to the two-way speed. The constancy of the one-way speed in any given inertial frame is the basis of his special theory of relativity, although all experimentally verifiable predictions of this theory do not depend on that convention.
Experiments that attempt to directly probe the one-way speed of light independent of synchronization have been proposed, but none have succeeded in doing so. Those experiments directly establish that synchronization with slow clock-transport is equivalent to Einstein synchronization, which is an important feature of special relativity. However, those experiments cannot directly establish the isotropy of the one-way speed of light since it has been shown that slow clock-transport, the laws of motion, and the way inertial reference frames are defined already involve the assumption of isotropic one-way speeds and thus, are equally conventional. In general, it was shown that these experiments are consistent with anisotropic one-way light speed as long as the two-way light speed is isotropic.
The 'speed of light' in this article refers to the speed of all electromagnetic radiation in vacuum.
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- "One-Way Speed of Light" | 2023-06-24 | 31 Upvotes 7 Comments
π Detention of Mark Bernstein
On 11 March 2022, Mark Izraylevich Bernstein (Russian: ΠΠ°ΡΠΊ ΠΠ·ΡΠ°ΠΉΠ»Π΅Π²ΠΈΡ ΠΠ΅ΡΠ½ΡΡΠ΅ΠΉΠ½), a Belarusian blogger and editor of the Russian-language Wikipedia based in Minsk, was detained by the Belarusian GUBOPiK security force after online accusations of violating the 2022 Russian fake news law for his editing of Wikipedia articles on the topic of the 2022 Russian invasion of Ukraine. He was sentenced to 15 days' administrative arrest under Article 24.3 of the Administrative Code of Belarus (for disobedience to police officers).
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- "Detention of Mark Bernstein" | 2022-06-23 | 112 Upvotes 21 Comments
π Regular Heptadecagon Inscribed in a Circle
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- "Regular Heptadecagon Inscribed in a Circle" | 2010-04-15 | 44 Upvotes 13 Comments
π Cherokee Syllabary
The Cherokee syllabary is a syllabary invented by Sequoyah in the late 1810s and early 1820s to write the Cherokee language. His creation of the syllabary is particularly noteworthy as he could not previously read any script. He first experimented with logograms, but his system later developed into a syllabary. In his system, each symbol represents a syllable rather than a single phoneme; the 85 (originally 86) characters provide a suitable method to write Cherokee. Although some symbols resemble Latin, Greek, and Cyrillic letters, they are not used to represent the same sounds.
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- "Cherokee Syllabary" | 2019-06-30 | 56 Upvotes 12 Comments