October 20, 2021
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Darmstadt is a city in the state of Hesse in Germany, located in the southern part of the Rhine-Main-Area (Frankfurt Metropolitan Region). Darmstadt has around 160,000 inhabitants, making it the fourth-largest city in the state of Hesse after Frankfurt am Main, Wiesbaden, and Kassel. Other major and local cities in the surrounding area are Frankfurt am Main and Offenbach, Wiesbaden and Mainz, Mannheim and Heidelberg.
Darmstadt holds the official title “City of Science” (German: Wissenschaftsstadt) as it is a major center of scientific institutions, universities, and high-technology companies. The European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) and the European Space Operations Centre (ESOC) are located in Darmstadt, as well as GSI Centre for Heavy Ion Research, where several chemical elements such as bohrium (1981), meitnerium (1982), hassium (1984), darmstadtium (1994), roentgenium (1994), and copernicium (1996) were discovered. The existence of the following elements were also confirmed at GSI Centre for Heavy Ion Research: nihonium (2012), flerovium (2009), moscovium (2012), livermorium (2010), and tennessine (2012). The Facility for Antiproton and Ion Research (FAIR) is an international accelerator facility under construction. Darmstadt is also the seat of the world’s oldest pharmaceutical company, Merck, which is the city’s largest employer.
The Mathildenhöhe, including the Darmstadt artists’ colony, a major center of the Jugendstil artistic movement, referring both to the group of artists active in the city in the late 19th and early 20th century, as well as the buildings which they designed, together with the Russian Chapel in Darmstadt, was recognized as a World Heritage Site by UNESCO in 2021.
Darmstadt was formerly the capital of a sovereign country, the Grand Duchy of Hesse, and its successor, the People’s State of Hesse, a federal state of Germany. As the capital of an increasingly prosperous duchy, the city gained some international prominence and remains one of the wealthiest cities in Europe. In the 20th century, industry (especially chemicals), as well as large science and electronics (and later, information technology) sectors became increasingly important, and are still a major part of the city’s economy. It is also home to the football club SV Darmstadt 98. Alexandra Feodorovna (Alix of Hesse), the wife of Nicholas II of Russia, as well as Maria Alexandrovna (Marie of Hesse), the wife of Alexander II of Russia, who were related, were born in this city. Wikipedia
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An image from Darmstadt, Germany
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October 20, 2021
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In 2017, an evolutionary biologist named R. Alexander Pyron ignited controversy with a Washington Post commentary titled “We don’t need to save endangered species. Extinction is part of evolution.” He wrote: “Conserving a species we have helped to kill off, but on which we are not directly dependent, serves to discharge our own guilt, but little else.”
Pyron’s take challenged the decades-old idea that biodiversity is a good thing — that humans should strive to preserve all forms of life on Earth and their interconnectedness across ecosystems. It prompted scientist and writer Carl Safina to mount a passionate defense of biodiversity, calling Pyron’s stance “conceptually confused” and containing “jarring assertions.” Safina’s most cutting rebuke was that belittling biodiversity derails environmental conversations. “It’s like answering ‘Black lives matter’ with ‘All lives matter,’” he wrote. “It’s a way of intentionally missing the point.”
Nobel Prize winners co-signed more rebuttals. Professors blogged long meditations on why endangered species need to be saved. There were scientists who had previously questioned hyperfocus on saving species, to be sure, though none had done so in such a public and broad-sweeping manner as Pyron. Josh Schimel, an ecologist at UC Santa Barbara, wrote: “Remember, you are a scientist — it is not your job to be right. It is your job to be thoughtful, careful, and analytical.” Pyron declined a request for comment for this story.
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Christina Animashaun/Vox
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October 20, 2021
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What will our Sun look like after it dies? Scientists have made predictions about what the end will look like for our Solar System, and when that will happen. And humans won’t be around to see the final act.
Previously, astronomers thought it would turn into a planetary nebula – a luminous bubble of gas and dust – until evidence suggested it would have to be a fair bit more massive.
An international team of astronomers flipped it again in 2018 and found that a planetary nebula is indeed the most likely solar corpse.
The Sun is about 4.6 billion years old – gauged on the age of other objects in the Solar System that formed around the same time. Based on observations of other stars, astronomers predict it will reach the end of its life in about another 10 billion years.
There are other things that will happen along the way, of course. In about 5 billion years, the Sun is due to turn into a red giant. The core of the star will shrink, but its outer layers will expand out to the orbit of Mars, engulfing our planet in the process. If it’s even still there.
One thing is certain: By that time, we won’t be around. In fact, humanity only has about 1 billion years left unless we find a way off this rock. That’s because the Sun is increasing in brightness by about 10 percent every billion years.
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(NASA/SDO)
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October 20, 2021
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October 19, 2021
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El Salvador, officially the Republic of El Salvador (Spanish: República de El Salvador), is a country in Central America. It is bordered on the northeast by Honduras, on the northwest by Guatemala, and on the south by the Pacific Ocean. El Salvador’s capital and largest city is San Salvador. The country’s population in 2021 is estimated to be 6.8 million.
Among the Mesoamerican nations that historically controlled the region are the Lenca (after 600 AD), the Mayans, and then the Cuzcatlecs.Archaeological monuments also suggest an early Olmec presence around the first millennium BC.In the beginning of the 16th century, the Spanish Empire conquered the Central American territory, incorporating it into the Viceroyalty of New Spain ruled from Mexico City. However, the Viceroyalty of Mexico had little to no influence in the daily affairs of the isthmus, which was colonized in 1524. In 1609, the area was declared the Captaincy General of Guatemala by the Spanish, which included the territory that would become El Salvador until its independence from Spain in 1821. It was forcefully incorporated into the First Mexican Empire, then seceded, joining the Federal Republic of Central America in 1823. When the federation dissolved in 1841, El Salvador became a sovereign state, then formed a short-lived union with Honduras and Nicaragua called the Greater Republic of Central America, which lasted from 1895 to 1898.
From the late 19th to the mid-20th century, El Salvador endured chronic political and economic instability characterized by coups, revolts, and a succession of authoritarian rulers. Persistent socioeconomic inequality and civil unrest culminated in the devastating Salvadoran Civil War from 1979 to 1992, fought between the military-led government backed by the United States, and a coalition of left-wing guerrilla groups. The conflict ended with the Chapultepec Peace Accords. This negotiated settlement established a multiparty constitutional republic, which remains in place to this day.
While this Civil War was going on in the country large numbers of Salvadorans emigrated to the United States, and by 2008 they were one of the largest immigrant groups in the US.
El Salvador’s economy has historically been dominated by agriculture, beginning with the Spanish taking control of the indigenous cacao crop in the 16th century, with production centered in Izalco, and the use of balsam from the ranges of La Libertad and Ahuachapan. This was followed by a boom in use of the indigo plant (añil in Spanish) in the 19th century, mainly for its use as a dye. Thereafter the focus shifted to coffee, which by the early 20th century accounted for 90% of export earnings. El Salvador has since reduced its dependence on coffee and embarked on diversifying its economy by opening up trade and financial links and expanding the manufacturing sector. The colón, the currency of El Salvador since 1892, was replaced by the United States dollar in 2001.
El Salvador ranks 124th among 189 countries in the Human Development Index. Despite high rates of poverty and gang-related violent crime, El Salvador has the second-highest level of income equality in Latin America, El Salvador is one of the least complex economies for doing business, and is the 34th happiest country in the world according to the Happy Planet Index. Wikipedia
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October 19, 2021
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Steven Weinberg, who died on July 23, towered over theoretical physics in the second half of the 20th century. He strongly believed that, armed only with the fundamental principles of relativity and quantum mechanics, the theoretical physicist can examine all phenomena in the universe — from the smallest to the largest scales. His work transformed our understanding of every aspect of fundamental physics in startlingly deep and original ways.
Weinberg was a master of quantum field theory, a branch of physics born from applying the rules of quantum mechanics to the electromagnetic field, which sees a particle — the photon —as a “quantized” excitation of the field. He was instrumental in propelling quantum field theory to astonishing new heights in the description of nature.
The themes of unification and symmetry drove all of Weinberg’s work and led to his famous breakthrough on electroweak unification, which revealed a hidden unity between two of the universe’s four fundamental forces. At first sight, the electromagnetic and weak interactions seem utterly different: We see electromagnetic waves as light in everyday life, while the weak force — responsible for radioactivity — operates on subnuclear scales. Weinberg realized that at very high energies, the two forces should be intertwined, described by what’s known as Yang-Mills theory, whose equations have a special property called gauge symmetry. But this essential commonality is hidden by the so-called Higgs mechanism, which generates masses for elementary particles such as the electron and the W and Z particles (which mediate short-range weak interactions), all the while leaving the long-range photon massless. The model he proposed in 1967 for realizing this vision made many detailed predictions and has been triumphantly confirmed by experiments beginning in the 1970s and ’80s, capped off by the 2012 discovery of the Higgs particle. Weinberg shared the 1979 Nobel Prize in Physics with Sheldon Glashow and Abdus Salam for this work, a pillar of the Standard Model of particle physics.
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Steven Weinberg at the American Physical Society Meeting in 1977. His work in particle physics redefined our understanding of the universe. AIP Emilio Segrè Visual Archives, Weber Collection
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October 19, 2021
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No matter where you look in the universe, in any direction, your line of sight will eventually run into some type of matter or radiation. The Earth is embedded in the solar system, with planets, moons, rocky and icy bodies, dust, and plasma particles permeating our environment. Beyond our own backyard are stars, gas, and dust strewn throughout the Milky Way, and at even greater cosmic distances are galaxies, quasars, and the matter in the intergalactic medium. If you somehow manage to pick a line of sight that doesn’t run into any of those, you’ll still encounter something: the cosmic microwave background, which is thought to be the leftover radiation from the early stages of the hot Big Bang.
And yet, no matter what we observe in any direction, two properties will correspond to whatever object we see:
- We are seeing the object not as it is today, but as it was a finite amount of time ago: when it emitted the light that’s now striking our eyes.
- That object is currently a specific distance away from us; if we could somehow “freeze” time and measure the distance between ourselves and that object, we’d get a certain value.
You might think that these two properties — time and distance — would be equal. A star whose light arrives after a journey of 10 years is 10 light-years away; a galaxy whose light arrives after a 100-million-year journey is 100 million light-years away; light from the Big Bang that arrives after a 13.8-billion-year journey has the emitting location 13.8 billion light-years away.
But that isn’t true at all — and the expanding universe is to blame.
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Artist’s logarithmic scale conception of the observable universe. Galaxies give way to large-scale structure and the hot, dense plasma of the Big Bang at the outskirts. This ‘edge’ is a boundary only in time. (Credit: Pablo Carlos Budassi; Unmismoobjetivo/Wikimedia Commons)
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October 19, 2021
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October 18, 2021
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Dallas is a city in the U.S. state of Texas and the largest city in and seat of Dallas County, with portions extending into Collin, Denton, Kaufman, and Rockwall counties. With a 2020 census population of 1,304,379, it is the ninth most populous city in the U.S. and the third-largest in Texas after Houston and San Antonio. Located in North Texas, the city of Dallas is the main core of the largest metropolitan area in the Southern United States and the largest inland metropolitan area in the U.S. that lacks any navigable link to the sea. It is the most populous city in the Dallas–Fort Worth metroplex, the fourth-largest metropolitan area in the country at 7.5 million people.
Dallas and nearby Fort Worth were initially developed due to the construction of major railroad lines through the area allowing access to cotton, cattle, and later oil in North and East Texas. The construction of the Interstate Highway System reinforced Dallas’s prominence as a transportation hub, with four major interstate highways converging in the city and a fifth interstate loop around it. Dallas then developed as a strong industrial and financial center and a major inland port, due to the convergence of major railroad lines, interstate highways, and the construction of Dallas/Fort Worth International Airport, one of the largest and busiest airports in the world. In addition, Dallas has DART (Dallas Area Rapid Transit) with different colored train lines that transport throughout the Metroplex.
Dominant sectors of its diverse economy include defense, financial services, information technology, telecommunications, and transportation. Dallas is home to nine Fortune 500 companies within the city limits while the Dallas–Fort Worth metroplex hosts twenty-two Fortune 500 companies, the second-most in Texas and fourth-most in the United States. Over 41 colleges and universities are located within its metropolitan area, which is the most of any metropolitan area in Texas. The city has a population from a myriad of ethnic and religious backgrounds and one of the largest LGBT communities in the U.S. WalletHub named Dallas the fifth most diverse city in the United States in 2018.
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An image from Dallas, TX USA
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October 18, 2021
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