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🔗 United States 🔗 Law 🔗 Politics 🔗 National Archives 🔗 Politics/American politics

The Alien and Sedition Acts were a set of four laws enacted in 1798 that applied restrictions to immigration and speech in the United States. The Naturalization Act increased the requirements to seek citizenship, the Alien Friends Act allowed the president to imprison and deport non-citizens, the Alien Enemies Act gave the president additional powers to detain non-citizens during times of war, and the Sedition Act criminalized false and malicious statements about the federal government. The Alien Friends Act and the Sedition Act expired after a set number of years, and the Naturalization Act was repealed in 1802. The Alien Enemies Act is still in effect.

The Alien and Sedition Acts were controversial. They were supported by the Federalist Party, and supporters argued that the bills strengthened national security during the Quasi-War, an undeclared naval war with France from 1798 to 1800. The acts were denounced by Democratic-Republicans as suppression of voters and violation of free speech under the First Amendment. While they were in effect, the Alien and Sedition Acts, and the Sedition Act in particular, were used to suppress publishers affiliated with the Democratic-Republicans, and several publishers were arrested for criticism of the Adams administration. The Democratic-Republicans took power in 1800, in part because of backlash to the Alien and Sedition Acts, and all but the Alien Enemies Act were eliminated by the next Congress. The Alien Enemies Act has been invoked several times since, particularly during World War II. The Alien and Sedition Acts are generally received negatively by modern historians, and the Supreme Court has since indicated that aspects of the laws would be found unconstitutional if challenged.

🔗 Electronics

A Wallace tree is an efficient hardware implementation of a digital circuit that multiplies two integers. It was devised by the Australian computer scientist Chris Wallace in 1964.

The Wallace tree has three steps:

1. Multiply (that is – AND) each bit of one of the arguments, by each bit of the other, yielding ${\displaystyle n^{2}}$ results. Depending on position of the multiplied bits, the wires carry different weights, for example wire of bit carrying result of ${\displaystyle a_{4}b_{3}}$ is 128 (see explanation of weights below).
2. Reduce the number of partial products to two by layers of full and half adders.
3. Group the wires in two numbers, and add them with a conventional adder.

The second step works as follows. As long as there are three or more wires with the same weight add a following layer:-

• Take any three wires with the same weights and input them into a full adder. The result will be an output wire of the same weight and an output wire with a higher weight for each three input wires.
• If there are two wires of the same weight left, input them into a half adder.
• If there is just one wire left, connect it to the next layer.

The benefit of the Wallace tree is that there are only ${\displaystyle O(\log n)}$ reduction layers, and each layer has ${\displaystyle O(1)}$ propagation delay. As making the partial products is ${\displaystyle O(1)}$ and the final addition is ${\displaystyle O(\log n)}$, the multiplication is only ${\displaystyle O(\log n)}$, not much slower than addition (however, much more expensive in the gate count). Naively adding partial products with regular adders would require ${\displaystyle O(\log ^{2}n)}$ time. From a complexity theoretic perspective, the Wallace tree algorithm puts multiplication in the class NC¹.

These computations only consider gate delays and don't deal with wire delays, which can also be very substantial.

The Wallace tree can be also represented by a tree of 3/2 or 4/2 adders.

It is sometimes combined with Booth encoding.

🔗 Military history 🔗 Military history/Military science, technology, and theory 🔗 Military history/Weaponry 🔗 Middle Ages 🔗 Middle Ages/History

A steam cannon is a cannon that launches a projectile using only heat and water, or using a ready supply of high-pressure steam from a boiler. The first steam cannon was designed by Archimedes during the Siege of Syracuse. Leonardo Da Vinci was also known to have designed one (see the Architonnerre).

The early device would consist of a large metal tube, preferably copper due to its high thermal conductivity, which would be placed in a furnace. One end of the tube would be capped and the other loaded with a projectile. Once the tube reached a high enough temperature, a small amount of water would be injected in behind the projectile. In theory, Leonardo da Vinci believed, the water would rapidly expand into vapour, blasting the projectile out the front of the barrel.

🔗 Technology 🔗 Lists 🔗 Futures studies 🔗 Invention

Emerging technologies are those technical innovations that represent progressive innovations within a field for competitive advantage.

🔗 Computing 🔗 Computing/Computer hardware

PLATO (Programmed Logic for Automatic Teaching Operations) was the first generalized computer-assisted instruction system. Starting in 1960, it ran on the University of Illinois' ILLIAC I computer. By the late 1970s, it supported several thousand graphics terminals distributed worldwide, running on nearly a dozen different networked mainframe computers. Many modern concepts in multi-user computing were originally developed on PLATO, including forums, message boards, online testing, e-mail, chat rooms, picture languages, instant messaging, remote screen sharing, and multiplayer video games.

PLATO was designed and built by the University of Illinois and functioned for four decades, offering coursework (elementary through university) to UIUC students, local schools, and other universities. Courses were taught in a range of subjects, including Latin, chemistry, education, music, and primary mathematics. The system included a number of features useful for pedagogy, including text overlaying graphics, contextual assessment of free-text answers, depending on the inclusion of keywords, and feedback designed to respond to alternative answers.

Rights to market PLATO as a commercial product were licensed by Control Data Corporation (CDC), the manufacturer on whose mainframe computers the PLATO IV system was built. CDC President William Norris planned to make PLATO a force in the computer world, but found that marketing the system was not as easy as hoped. PLATO nevertheless built a strong following in certain markets, and the last production PLATO system did not shut down until 2006, coincidentally just a month after Norris died.

🔗 Germany 🔗 Disaster management 🔗 Politics 🔗 European history 🔗 Crime and Criminal Biography 🔗 Firefighting

The Reichstag fire (German: Reichstagsbrand, pronounced [ˈʁaɪçstaːksˌbʁant] ) was an arson attack on the Reichstag building, home of the German parliament in Berlin, on Monday, 27 February 1933, precisely four weeks after Adolf Hitler was sworn in as Chancellor of Germany. Marinus van der Lubbe, a Dutch council communist, was said to be the culprit; the Nazis attributed the fire to a group of Communist agitators, used it as a pretext to claim that Communists were plotting against the German government, and induced President Paul von Hindenburg to issue the Reichstag Fire Decree, suspending civil liberties, and pursue a "ruthless confrontation" with the Communists. This made the fire pivotal in the establishment of Nazi rule in Germany.

The first report of the fire came shortly after 9:00 p.m., when a Berlin fire station received an alarm call. By the time police and firefighters arrived, the structure was engulfed in flames. The police conducted a thorough search inside the building and found Van der Lubbe, who was arrested.

After the Fire Decree was issued, the police – now controlled by Hitler's Nazi Party – made mass arrests of communists, including all of the communist Reichstag delegates. This severely crippled communist participation in the 5 March elections. After the 5 March elections, the absence of the communists allowed the Nazi Party to expand their plurality in the Reichstag, greatly assisting the Nazi seizure of total power. On 9 March 1933 the Prussian state police arrested Bulgarians Georgi Dimitrov, Vasil Tanev, and Blagoy Popov, who were known Comintern operatives (though the police did not know it then, Dimitrov was head of all Comintern operations in Western Europe). Ernst Torgler, chairman of the KPD Reichstag faction, had surrendered to police on 28 February.

Van der Lubbe and the four communists were the defendants in a trial that started in September 1933. It ended in the acquittal of the four communists and the conviction of Van der Lubbe, who was then executed. In 2008, Germany posthumously pardoned Van der Lubbe under a law introduced in 1998 to lift unjust verdicts from the Nazi era. The responsibility for the Reichstag fire remains a topic of debate, as while Van der Lubbe was found guilty, it is unclear whether he acted alone. The consensus amongst historians is the Reichstag was set ablaze by Van der Lubbe; some consider it to have been a part of a Nazi plot, a view Richard J. Evans labels a conspiracy theory.

🔗 Catholicism 🔗 Japan 🔗 Japan/Religion 🔗 Secret Societies

Kakure kirishitan (Japanese: 隠れキリシタン, lit. 'hidden Christians') is a modern term for a member of the Catholic Church in Japan that went underground at the start of the Edo period in the early 17th century due to Christianity's repression by the Tokugawa shogunate.

🔗 France 🔗 Birds 🔗 Overseas France

Tromelin Island (; French: Île Tromelin, pronounced [il tʁɔmlɛ̃]) is a low, flat island in the Indian Ocean about 500 kilometres (310 mi) north of Réunion and about 450 kilometres (280 mi) east of Madagascar. Tromelin is administered as part of the French Southern and Antarctic Lands, a French Overseas Territory, but Mauritius claims sovereignty over the island.

Tromelin has facilities for scientific expeditions and a weather station. It is a nesting site for birds and green sea turtles.

🔗 Medicine 🔗 Linguistics 🔗 Linguistics/Applied Linguistics

Semantic satiation is a psychological phenomenon in which repetition causes a word or phrase to temporarily lose meaning for the listener, who then perceives the speech as repeated meaningless sounds. Extended inspection or analysis (staring at the word or phrase for a lengthy period of time) in place of repetition also produces the same effect.

🔗 Chemical and Bio Engineering

In flow chemistry, a chemical reaction is run in a continuously flowing stream rather than in batch production. In other words, pumps move fluid into a tube, and where tubes join one another, the fluids contact one another. If these fluids are reactive, a reaction takes place. Flow chemistry is a well-established technique for use at a large scale when manufacturing large quantities of a given material. However, the term has only been coined recently for its application on a laboratory scale. Often, microreactors are used.