Econstudentlog

Wikipedia articles of interest

i. Great Fire of London (featured).

Great_Fire_London

“The Great Fire of London was a major conflagration that swept through the central parts of the English city of London, from Sunday, 2 September to Wednesday, 5 September 1666.[1] The fire gutted the medieval City of London inside the old Roman city wall. It threatened, but did not reach, the aristocratic district of Westminster, Charles II‘s Palace of Whitehall, and most of the suburban slums.[2] It consumed 13,200 houses, 87 parish churches, St. Paul’s Cathedral and most of the buildings of the City authorities. It is estimated to have destroyed the homes of 70,000 of the City’s 80,000 inhabitants.”

Do note that even though this fire was a really big deal the ‘70,000 out of 80,000’ number can be misleading as many Londoners didn’t actually live in the City proper:

“By the late 17th century, the City proper—the area bounded by the City wall and the River Thames—was only a part of London, covering some 700.0 acres (2.833 km2; 1.0938 sq mi),[7] and home to about 80,000 people, or one sixth of London’s inhabitants. The City was surrounded by a ring of inner suburbs, where most Londoners lived.”

I thought I should include a few observations related to how well people behaved in this terrible situation – humans are really wonderful sometimes, and of course the people affected by the fire did everything they could to stick together and help each other out:

“Order in the streets broke down as rumours arose of suspicious foreigners setting fires. The fears of the homeless focused on the French and Dutch, England‘s enemies in the ongoing Second Anglo-Dutch War; these substantial immigrant groups became victims of lynchings and street violence.” […] [no, wait…]

“Suspicion soon arose in the threatened city that the fire was no accident. The swirling winds carried sparks and burning flakes long distances to lodge on thatched roofs and in wooden gutters, causing seemingly unrelated house fires to break out far from their source and giving rise to rumours that fresh fires were being set on purpose. Foreigners were immediately suspects because of the current Second Anglo-Dutch War. As fear and suspicion hardened into certainty on the Monday, reports circulated of imminent invasion, and of foreign undercover agents seen casting “fireballs” into houses, or caught with hand grenades or matches.[37] There was a wave of street violence.[38] William Taswell saw a mob loot the shop of a French painter and level it to the ground, and watched in horror as a blacksmith walked up to a Frenchman in the street and hit him over the head with an iron bar.

The fears of terrorism received an extra boost from the disruption of communications and news as facilities were devoured by the fire. The General Letter Office in Threadneedle Street, through which post for the entire country passed, burned down early on Monday morning. The London Gazette just managed to put out its Monday issue before the printer’s premises went up in flames (this issue contained mainly society gossip, with a small note about a fire that had broken out on Sunday morning and “which continues still with great violence”). The whole nation depended on these communications, and the void they left filled up with rumours. There were also religious alarms of renewed Gunpowder Plots. As suspicions rose to panic and collective paranoia on the Monday, both the Trained Bands and the Coldstream Guards focused less on fire fighting and more on rounding up foreigners, Catholics, and any odd-looking people, and arresting them or rescuing them from mobs, or both together.”

I didn’t really know what to think about this part:

“An example of the urge to identify scapegoats for the fire is the acceptance of the confession of a simple-minded French watchmaker, Robert Hubert, who claimed he was an agent of the Pope and had started the Great Fire in Westminster.[55] He later changed his story to say that he had started the fire at the bakery in Pudding Lane. Hubert was convicted, despite some misgivings about his fitness to plead, and hanged at Tyburn on 28 September 1666. After his death, it became apparent that he had not arrived in London until two days after the fire started.”

Just one year before the fire, London had incidentally been hit by a plague outbreak which “is believed to have killed a sixth of London’s inhabitants, or 80,000 people”. Being a Londoner during the 1660s probably wasn’t a great deal of fun. On the other hand this disaster was actually not that big of a deal when compared to e.g. the 1556 Shaanxi earthquake.

ii. Sea (featured). I was considering reading an oceanography textbook a while back, but I decided against it and I read this article ‘instead’. Some interesting stuff in there. A few observations from the article:

“About 97.2 percent of the Earth’s water is found in the sea, some 1,360,000,000 cubic kilometres (330,000,000 cu mi) of salty water.[12] Of the rest, 2.15 percent is accounted for by ice in glaciers, surface deposits and sea ice, and 0.65 percent by vapour and liquid fresh water in lakes, rivers, the ground and the air.[12]

“The water in the sea was once thought to come from the Earth’s volcanoes, starting 4 billion years ago, released by degassing from molten rock.[3](pp24–25) More recent work suggests that much of the Earth’s water may have come from comets.[16]” (This stuff covers 70 percent of the planet and we still are not completely sure how it got to be here. I’m often amazed at how much stuff we know about the world, but very occasionally I also get amazed at the things we don’t know. This seems like the sort of thing we somehow ‘ought to know’..)

“An important characteristic of seawater is that it is salty. Salinity is usually measured in parts per thousand (expressed with the ‰ sign or “per mil”), and the open ocean has about 35 grams (1.2 oz) of solids per litre, a salinity of 35‰ (about 90% of the water in the ocean has between 34‰ and 35‰ salinity[17]). […] The constituents of table salt, sodium and chloride, make up about 85 percent of the solids in solution. […] The salinity of a body of water varies with evaporation from its surface (increased by high temperatures, wind and wave motion), precipitation, the freezing or melting of sea ice, the melting of glaciers, the influx of fresh river water, and the mixing of bodies of water of different salinities.”

“Sea temperature depends on the amount of solar radiation falling on its surface. In the tropics, with the sun nearly overhead, the temperature of the surface layers can rise to over 30 °C (86 °F) while near the poles the temperature in equilibrium with the sea ice is about −2 °C (28 °F). There is a continuous circulation of water in the oceans. Warm surface currents cool as they move away from the tropics, and the water becomes denser and sinks. The cold water moves back towards the equator as a deep sea current, driven by changes in the temperature and density of the water, before eventually welling up again towards the surface. Deep seawater has a temperature between −2 °C (28 °F) and 5 °C (41 °F) in all parts of the globe.[23]

“The amount of light that penetrates the sea depends on the angle of the sun, the weather conditions and the turbidity of the water. Much light gets reflected at the surface, and red light gets absorbed in the top few metres. […] There is insufficient light for photosynthesis and plant growth beyond a depth of about 200 metres (660 ft).[27]

“Over most of geologic time, the sea level has been higher than it is today.[3](p74) The main factor affecting sea level over time is the result of changes in the oceanic crust, with a downward trend expected to continue in the very long term.[73] At the last glacial maximum, some 20,000 years ago, the sea level was 120 metres (390 ft) below its present-day level.” (this of course had some very interesting ecological effects – van der Geer et al. had some interesting observations on that topic)

“On her 68,890-nautical-mile (127,580 km) journey round the globe, HMS Challenger discovered about 4,700 new marine species, and made 492 deep sea soundings, 133 bottom dredges, 151 open water trawls and 263 serial water temperature observations.[115]

“Seaborne trade carries more than US $4 trillion worth of goods each year.[139]

“Many substances enter the sea as a result of human activities. Combustion products are transported in the air and deposited into the sea by precipitation. Industrial outflows and sewage contribute heavy metals, pesticides, PCBs, disinfectants, household cleaning products and other synthetic chemicals. These become concentrated in the surface film and in marine sediment, especially estuarine mud. The result of all this contamination is largely unknown because of the large number of substances involved and the lack of information on their biological effects.[199] The heavy metals of greatest concern are copper, lead, mercury, cadmium and zinc which may be bio-accumulated by marine invertebrates. They are cumulative toxins and are passed up the food chain.[200]

Much floating plastic rubbish does not biodegrade, instead disintegrating over time and eventually breaking down to the molecular level. Rigid plastics may float for years.[201] In the centre of the Pacific gyre there is a permanent floating accumulation of mostly plastic waste[202] and there is a similar garbage patch in the Atlantic.[203] […] Run-off of fertilisers from agricultural land is a major source of pollution in some areas and the discharge of raw sewage has a similar effect. The extra nutrients provided by these sources can cause excessive plant growth. Nitrogen is often the limiting factor in marine systems, and with added nitrogen, algal blooms and red tides can lower the oxygen level of the water and kill marine animals. Such events have created dead zones in the Baltic Sea and the Gulf of Mexico.[205]

iii. List of chemical compounds with unusual names. Technically this is not an article, but I decided to include it here anyway. A few examples from the list:

“Ranasmurfin: A blue protein from the foam nests of a tropical frog, named after the Smurfs.”

“Sonic hedgehog: A protein named after Sonic the Hedgehog.”

Arsole: (C4H5As), an analogue of pyrrole in which an arsenic atom replaces the nitrogen atom.[16]

“DAMN: Diaminomaleonitrile, a cyanocarbon that contains two amine groups and two nitrile groups bound to an ethylene backbone.”

fucK: The name of the gene that encodes L-fuculokinase, an enzyme that catalyzes a chemical reaction between L-fuculose, ADP, and L-fuculose-1-phosphate.[3]

Moronic acid: Moronic acid [3-oxoolean-18-en-28-oic acid], a natural triterpene

Draculin: An anticoagulant found in the saliva of vampire bats.[27]

iv. Operation Proboi. When trying to make sense of e.g. the reactions of people living in the Baltic countries to Russia’s ‘current activities’ in the Ukraine, it probably helps to know stuff like this. 1949 isn’t that long ago – if my father had been born in Latvia he might have been one of the people in the photo.

v. Schrödinger equation. I recently started reading  A. C. Phillips’ Introduction to Quantum Mechanics – chapter 2 deals with this topic. Due to the technical nature of the book I’m incidentally not sure to which extent I’ll cover the book here (or for that matter whether I’ll be able to finish it..) – if I do decide to cover it in some detail I’ll probably include relevant links to wikipedia along the way. The wiki has a lot of stuff on these topics, but textbooks are really helpful in terms of figuring out the order in which you should proceed.

vi. Happisburgh footprints. ‘A small step for man, …’

“The Happisburgh footprints were a set of fossilized hominin footprints that date to the early Pleistocene. They were discovered in May 2013 in a newly uncovered sediment layer on a beach at Happisburgh […] in Norfolk, England, and were destroyed by the tide shortly afterwards.  Results of research on the footprints were announced on 7 February 2014, and identified them as dating to more than 800,000 years ago, making them the oldest known hominin footprints outside Africa.[1][2][3] Before the Happisburgh discovery, the oldest known footprints in Britain were at Uskmouth in South Wales, from the Mesolithic and carbon-dated to 4,600 BC.[4]”

The fact that we found these footprints is awesome. The fact that we can tell that they are as old as they are is awesome. There’s a lot of awesome stuff going on here – Happisburg also simply seems to be a gift that keeps on giving:

“Happisburgh has produced a number of significant archaeological finds over many years. As the shoreline is subject to severe coastal erosion, new material is constantly being exposed along the cliffs and on the beach. Prehistoric discoveries have been noted since 1820, when fishermen trawling oyster beds offshore found their nets had brought up teeth, bones, horns and antlers from elephants, rhinos, giant deer and other extinct species. […]

In 2000, a black flint handaxe dating to between 600,000 and 800,000 years ago was found by a man walking on the beach. In 2012, for the television documentary Britain’s Secret Treasures, the handaxe was selected by a panel of experts from the British Museum and the Council for British Archaeology as the most important item on a list of fifty archaeological discoveries made by members of the public.[14][15] Since its discovery, the palaeolithic history of Happisburgh has been the subject of the Ancient Human Occupation of Britain (AHOB) and Pathways to Ancient Britain (PAB) projects […] Between 2005 and 2010 eighty palaeolithic flint tools, mostly cores, flakes and flake tools were excavated from the foreshore in sediment dating back to up to 950,000 years ago.”

vii. Keep (‘good article’).

800px-Warkworth_Castle_2

“A keep (from the Middle English kype) is a type of fortified tower built within castles during the Middle Ages by European nobility. Scholars have debated the scope of the word keep, but usually consider it to refer to large towers in castles that were fortified residences, used as a refuge of last resort should the rest of the castle fall to an adversary. The first keeps were made of timber and formed a key part of the motte and bailey castles that emerged in Normandy and Anjou during the 10th century; the design spread to England as a result of the Norman invasion of 1066, and in turn spread into Wales during the second half of the 11th century and into Ireland in the 1170s. The Anglo-Normans and French rulers began to build stone keeps during the 10th and 11th centuries; these included Norman keeps, with a square or rectangular design, and circular shell keeps. Stone keeps carried considerable political as well as military importance and could take up to a decade to build.

During the 12th century new designs began to be introduced – in France, quatrefoil-shaped keeps were introduced, while in England polygonal towers were built. By the end of the century, French and English keep designs began to diverge: Philip II of France built a sequence of circular keeps as part of his bid to stamp his royal authority on his new territories, while in England castles were built that abandoned the use of keeps altogether. In Spain, keeps were increasingly incorporated into both Christian and Islamic castles, although in Germany tall towers called Bergfriede were preferred to keeps in the western fashion. In the second half of the 14th century there was a resurgence in the building of keeps. In France, the keep at Vincennes began a fashion for tall, heavily machicolated designs, a trend adopted in Spain most prominently through the Valladolid school of Spanish castle design. Meanwhile, in England tower keeps became popular amongst the most wealthy nobles: these large keeps, each uniquely designed, formed part of the grandest castles built during the period.

By the 16th century, however, keeps were slowly falling out of fashion as fortifications and residences. Many were destroyed between the 17th and 18th centuries in civil wars, or incorporated into gardens as an alternative to follies. During the 19th century, keeps became fashionable once again and in England and France a number were restored or redesigned by Gothic architects. Despite further damage to many French and Spanish keeps during the wars of the 20th century, keeps now form an important part of the tourist and heritage industry in Europe. […]

“By the 15th century it was increasingly unusual for a lord to build both a keep and a large gatehouse at the same castle, and by the early 16th century the gatehouse had easily overtaken the keep as the more fashionable feature: indeed, almost no new keeps were built in England after this period.[99] The classical Palladian style began to dominate European architecture during the 17th century, causing a further move away from the use of keeps. […] From the 17th century onwards, some keeps were deliberately destroyed. In England, many were destroyed after the end of the Second English Civil War in 1649, when Parliament took steps to prevent another royalist uprising by slighting, or damaging, castles so as to prevent them from having any further military utility. Slighting was quite expensive and took considerable effort to carry out, so damage was usually done in the most cost efficient fashion with only selected walls being destroyed.[103] Keeps were singled out for particular attention in this process because of their continuing political and cultural importance, and the prestige they lent their former royalist owners […] There were some equivalent destruction of keeps in France in the 17th and 18th centuries […] The Spanish Civil War and First and Second World Wars in the 20th century caused damage to many castle keeps across Europe; in particular, the famous keep at Coucy was destroyed by the German Army in 1917.[111] By the late 20th century, however, the conservation of castle keeps formed part of government policy across France, England, Ireland and Spain.[112] In the 21st century in England, most keeps are ruined and form part of the tourism and heritage industries, rather than being used as functioning buildings – the keep of Windsor Castle being a rare exception. This is contrast to the fate of bergfried towers in Germany, large numbers of which were restored as functional buildings in the late 19th and early 20th century, often as government offices or youth hostels, or the modern conversion of tower houses, which in many cases have become modernised domestic homes.[113]

viii. Battles of Khalkhin Gol. I decided to look up that stuff because of some of the comments in this thread.

“The Battles of Khalkhyn Gol […] constituted the decisive engagement of the undeclared Soviet–Japanese border conflicts fought among the Soviet Union, Mongolia and the Empire of Japan in 1939. The conflict was named after the river Khalkhyn Gol, which passes through the battlefield. In Japan, the decisive battle of the conflict is known as the Nomonhan Incident […] after a nearby village on the border between Mongolia and Manchuria. The battles resulted in the defeat of the Japanese Sixth Army. […]

While this engagement is little-known in the West, it played an important part in subsequent Japanese conduct in World War II. This defeat, together with other factors, moved the Imperial General Staff in Tokyo away from the policy of the North Strike Group favored by the Army, which wanted to seize Siberia as far as Lake Baikal for its resources. […] Other factors included the signing of the Nazi-Soviet non-aggression pact, which deprived the Army of the basis of its war policy against the USSR. Nomonhan earned the Kwantung Army the displeasure of officials in Tokyo, not so much due to its defeat, but because it was initiated and escalated without direct authorization from the Japanese government. Politically, the defeat also shifted support to the South Strike Group, favored by the Navy, which wanted to seize the resources of Southeast Asia, especially the petroleum and mineral-rich Dutch East Indies. Two days after the Eastern Front of World War II broke out, the Japanese army and navy leaders adopted on 24 June 1941 a resolution “not intervening in German Soviet war for the time being”. In August 1941, Japan and the Soviet Union reaffirmed their neutrality pact.[38] Since the European colonial powers were weakening and suffering early defeats in the war with Germany, coupled with their embargoes on Japan (especially of vital oil) in the second half of 1941, Japan’s focus was ultimately focused on the south, and led to its decision to launch the attack on Pearl Harbor, on 7 December that year.”

Note that there’s some disagreement in the reddit thread as to how important Khalkhin Gol really was – one commenter e.g. argues that: “Khalkhin Gol is overhyped as a factor in the Japanese decision for the southern plan.”

ix. Medical aspects, Hiroshima, Japan, 1946. Technically this is also not a wikipedia article, but multiple wikipedia articles link to it and it is a wikipedia link. The link is to a video featuring multiple people who were harmed by the first nuclear weapon used by humans in warfare. Extensive tissue damage, severe burns, scars – it’s worth having in mind that dying from cancer is not the only concern facing people who survive a nuclear blast. A few related links: a) How did cleanup in Nagasaki and Hiroshima proceed following the atom bombs? b) Minutes of the second meeting of the Target Committee Los Alamos, May 10-11, 1945. c) Keloid. d) Japan in the 1950s (pictures).

April 11, 2014 - Posted by | archaeology, history, medicine, Physics, wikipedia

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