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🔗 Climate change 🔗 Environment 🔗 Geology

Milankovitch cycles describe the collective effects of changes in the Earth's movements on its climate over thousands of years. The term is named for Serbian geophysicist and astronomer Milutin Milanković. In the 1920s, he hypothesized that variations in eccentricity, axial tilt, and precession resulted in cyclical variation in the solar radiation reaching the Earth, and that this orbital forcing strongly influenced climatic patterns on Earth.

Similar astronomical hypotheses had been advanced in the 19th century by Joseph Adhemar, James Croll and others, but verification was difficult because there was no reliably dated evidence, and because it was unclear which periods were important.

Now, materials on Earth that have been unchanged for millennia (obtained via ice, rock, and deep ocean cores) are being studied to indicate the history of Earth's climate. Though they are consistent with the Milankovitch hypothesis, there are still several observations that the hypothesis does not explain.

🔗 Military history 🔗 Military history/North American military history 🔗 Military history/United States military history 🔗 Military history/Military science, technology, and theory 🔗 Military history/Weaponry

The demon core was a spherical 6.2-kilogram (14 lb) subcritical mass of plutonium 89 millimetres (3.5 in) in diameter, that was involved in two criticality accidents, on August 21, 1945 and May 21, 1946. The core was intended for use in a third nuclear weapon, but remained in use for testing after Japan's surrender. It was designed with a small safety margin to ensure a successful explosion of the bomb. The device briefly went supercritical when it was accidentally placed in supercritical configurations during two separate experiments intended to guarantee the core was indeed close to the critical point. The incidents happened at the Los Alamos Laboratory in 1945 and 1946, both resulting in the acute radiation poisoning and subsequent deaths of scientists: Harry Daghlian and Louis Slotin. After these incidents the spherical plutonium core was referred to as the "demon core".

🔗 Business 🔗 Psychology 🔗 Education

Linda Stone, a tech writer and consultant, coined the term continuous partial attention in 1998 to describe a modern adaptive behavior of continuously dividing one's attention. Stone has clarified that continuous partial attention is not the same as multi-tasking. Where multi-tasking is driven by a conscious desire to be productive and efficient, CPA is an automatic process motivated only by "a desire to be a live node on the network" or by the willingness to connect and stay connected, scanning and optimizing opportunities, activities and contacts in an effort to not miss anything that is going on.

Continuous partial attention is not necessarily a dysfunctional state. However, it may lead to increased stress and decreased ability to focus and concentrate on the present moment, prohibiting reflection, contemplation, and thoughtful decision making. The constant connectedness that is associated with continuous partial attention may also affect relationships, lower productivity levels, and lead to over-stimulation and a lack of fulfillment.

Linda Stone's research has focused on examples in the United States though she has posited that, "We may not all find ourselves in the same attention era at the same time. We are likely to find ourselves experiencing a flow: attraction to an ideal, taking the expression of the ideal to an extreme and experiencing unintended and less than pleasant consequences, giving birth to and launching a new ideal while integrating the best of what came before."

🔗 Politics 🔗 Anti-war 🔗 Globalization

Global Peace Index (GPI) measures the relative position of nations' and regions' peacefulness. The GPI ranks 172 independent states and territories (99.7 percent of the world's population) according to their levels of peacefulness. In the past decade, the GPI has presented trends of increased global violence and less peacefulness. It also increases the world peace program in the world.

The GPI is a report produced by the Institute for Economics & Peace (IEP) and developed in consultation with an international panel of peace experts from peace institutes and think tanks with data collected and collated by the Economist Intelligence Unit. The Index was first launched in May 2009, with subsequent reports being released annually. In 2015 it ranked 165 countries, up from 121 in 2007. The study was conceived by Australian technology entrepreneur Steve Killelea, and is endorsed by individuals such as former UN Secretary-General Kofi Annan, the Dalai Lama, archbishop Desmond Tutu, former President of Finland and 2008 Nobel Peace Prize laureate Martti Ahtisaari, Nobel laureate Muhammad Yunus, economist Jeffrey Sachs, former president of Ireland Mary Robinson, former Deputy Secretary-General of the United Nations Jan Eliasson and former United States president Jimmy Carter. The updated index is released each year at events in London, Washington, DC; and at the United Nations Secretariat in New York.

The 2019 GPI indicates Iceland, New Zealand, Portugal, Austria and Denmark to be the most peaceful countries and Somalia, Afghanistan, Syria, South Sudan, Yemen, and Iraq to be the least peaceful. Long-term findings of the 2017 GPI include a less peaceful world over the past decade, a 2.14 per cent deterioration in the global level of peace in the past decade, growing inequality in peace between the most and least peaceful countries, a long-term reduction in the GPI Militarization domain, and a widening impact of terrorism, with historically high numbers of people killed in terrorist incidents over the past 10 years.

🔗 United States 🔗 United States/North Carolina 🔗 Appalachia 🔗 Tennessee

In the Appalachian Mountains of the eastern United States, balds are mountain summits or crests covered primarily by thick vegetation of native grasses or shrubs occurring in areas where heavy forest growth would be expected.

Balds are found primarily in the Southern Appalachians, where, even at the highest elevations, the climate is too warm to support an alpine zone, areas where trees fail to grow due to short or non-existent growing seasons. The difference between an alpine summit, such as Mount Washington in New Hampshire, and a bald, such as Gregory Bald in the Great Smoky Mountains, is that a lack of trees is normal for the colder climate of the former but abnormal for the warmer climate of the latter. One example of southern balds' abnormality can be found at Roan Mountain, where Roan High Knob (el. 6,285 ft/1,915 m) is coated with a dense stand of spruce-fir forest, whereas an adjacent summit, Round Bald (el. 5,826 ft/1,776 m), is almost entirely devoid of trees. Why some summits are bald and some are not is a mystery, though there are several hypotheses.

🔗 Philosophy 🔗 Philosophy/Logic

In logic, a many-valued logic (also multi- or multiple-valued logic) is a propositional calculus in which there are more than two truth values. Traditionally, in Aristotle's logical calculus, there were only two possible values (i.e., "true" and "false") for any proposition. Classical two-valued logic may be extended to n-valued logic for n greater than 2. Those most popular in the literature are three-valued (e.g., Łukasiewicz's and Kleene's, which accept the values "true", "false", and "unknown"), the finite-valued (finitely-many valued) with more than three values, and the infinite-valued (infinitely-many-valued), such as fuzzy logic and probability logic.

🔗 Musical Instruments 🔗 Electronic music

The Ondioline is an electronic keyboard instrument, invented in 1941 by the Frenchman Georges Jenny, and is a forerunner of today's synthesizers. It is sometimes called the "Jenny Ondioline."

The Ondioline is capable of creating a wide variety of sounds. Its keyboard has an unusual feature: it is suspended on special springs which makes it possible to introduce a natural vibrato if the player moves the keyboard (not the entire instrument) from side to side (laterally) with their playing hand. The result is an almost human-like vibrato that lends a wide range of expression to the Ondioline. The keyboard is also pressure-sensitive, and the instrument has a knee volume lever, as well.

🔗 Environment 🔗 Disaster management 🔗 Agriculture 🔗 Norway 🔗 Plants 🔗 Genetics

The Svalbard Global Seed Vault (Norwegian: Svalbard globale frøhvelv) is a secure seed bank on the Norwegian island of Spitsbergen in the remote Arctic Svalbard archipelago. Conservationist Cary Fowler, in association with the Consultative Group on International Agricultural Research (CGIAR), started the vault to preserve a wide variety of plant seeds that are duplicate samples, or "spare" copies, of seeds held in gene banks worldwide. The seed vault is an attempt to ensure against the loss of seeds in other genebanks during large-scale regional or global crises. The seed vault is managed under terms spelled out in a tripartite agreement among the Norwegian government, the Crop Trust, and the Nordic Genetic Resource Center (NordGen).

The Norwegian government entirely funded the vault's approximately 45 million kr (US$8.8 million in 2008) construction. Storing seeds in the vault is free to end users; Norway and the Crop Trust pay for operational costs. Primary funding for the Trust comes from organisations such as the Bill & Melinda Gates Foundation and from various governments worldwide.

🔗 Amateur radio

Olivia MFSK is an amateur radioteletype protocol, using multiple frequency-shift keying (MFSK) and designed to work in difficult (low signal-to-noise ratio plus multipath propagation) conditions on shortwave bands. The signal can be accurately received even if the surrounding noise is 10 dB stronger. It is commonly used by amateur radio operators to reliably transmit ASCII characters over noisy channels using the high frequency (3–30 MHz) spectrum. The effective data rate of the Olivia MFSK protocol is 150 characters/minute.

Olivia modes are commonly referred to as Olivia X / Y (or, alternatively, Olivia Y / X ), where X refers to the number of different audio tones transmitted and Y refers to the bandwidth in hertz over which these signals are spread. Examples of common Olivia modes are 16/500, 32/1000 and 8/250.

🔗 Economics 🔗 Transport

The Downs–Thomson paradox (named after Anthony Downs and John Michael Thomson), also known as the Pigou–Knight–Downs paradox (after Arthur Cecil Pigou and Frank Knight), states that the equilibrium speed of car traffic on a road network is determined by the average door-to-door speed of equivalent journeys taken by public transport.

It is a paradox in that improvements in the road network will not reduce traffic congestion. Improvements in the road network can make congestion worse if the improvements make public transport more inconvenient or if it shifts investment, causing disinvestment in the public transport system.