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🔗 Germany 🔗 Germany/Hamburg 🔗 Germany/German transportation

Old Elbe Tunnel or St. Pauli Elbe Tunnel (German: Alter Elbtunnel colloquially or St. Pauli Elbtunnel officially) which opened in 1911, is a pedestrian and vehicle tunnel in Hamburg. The 426 m (1,398 ft) long tunnel was a technical sensation; 24 m (80 ft) beneath the surface, two 6 m (20 ft) diameter tubes connect central Hamburg with the docks and shipyards on the south side of the river Elbe. This was a big improvement for tens of thousands of workers in one of the busiest harbors in the world.

Six large lifts on either side of the tunnel carry pedestrians and vehicles to the bottom. The two tunnels are both still in operation, though due to their limited capacity by today's standards, other bridges and tunnels have been built and taken over most of the traffic.

In 2008 approximately 300,000 cars, 63,000 bicycles, and 700,000 pedestrians used the tunnel. The tunnel is opened 24 hours for pedestrians and bicycles. For motorized vehicles, opening times are currently Monday to Friday from 5:20 a.m. to 8:00 p.m. and on Saturdays from 5:20 a.m. to 4:00 p.m.

🔗 Astronomy 🔗 Astronomy/Astronomical objects

iPTF14hls is an unusual supernova star that erupted continuously for about 1,000 days beginning in September 2014 before becoming a remnant nebula. It had previously erupted in 1954. None of the theories nor proposed hypotheses fully explain all the aspects of the object.

🔗 Spaceflight

Project Starlight is a research project of the University of California, Santa Barbara to develop a fleet of laser beam-propelled interstellar probes and sending them to a star neighboring the Solar System, potentially Alpha Centauri. The project aims to send organisms on board the probe.

🔗 Food and drink 🔗 Japan

Toilet meal (Japanese: 便所飯, benjo-meshi) is a Japanese slang term and social phenomenon referring to the act of an individual eating a meal in a toilet room. In modern Japan, some people eat alone in a bathroom for various reasons; the most common reason is that they do not wish to be seen eating alone. Other reasons include saving money from eating out, to hide from co-workers in a busy workplace, or simply because they find it more comfortable.

Since toilet meals are often solitary and clandestine, others are unlikely to be aware of its occurrence. For this reason, "toilet meals" were initially regarded as an urban legend, but subsequent investigations have confirmed the phenomenon as relatively widespread. The term "toilet meal" has even been referenced in various popular media, most notably in various Japanese television shows.

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

The hafnium controversy is a debate over the possibility of 'triggering' rapid energy releases, via gamma ray emission, from a nuclear isomer of hafnium, ^178m2Hf. The energy release is potentially 5 orders of magnitude (100,000 times) more energetic than a chemical reaction, but 2 orders of magnitude less than a nuclear fission reaction. In 1998, a group led by Carl Collins of the University of Texas at Dallas reported having successfully initiated such a trigger. Signal-to-noise ratios were small in those first experiments, and to date no other group has been able to duplicate these results. Peter Zimmerman described claims of weaponization potential as having been based on "very bad science".

🔗 Biography 🔗 Human rights 🔗 Russia 🔗 Russia/mass media in Russia 🔗 Politics 🔗 Guild of Copy Editors 🔗 Women writers 🔗 Biography/arts and entertainment 🔗 Biography/politics and government 🔗 Journalism 🔗 Ukraine 🔗 Russia/politics and law of Russia 🔗 Russia/history of Russia

Anna Stepanovna Politkovskaya (Russian: Анна Степановна Политковская, IPA: [ˈanːə sʲtʲɪˈpanəvnə pəlʲɪtˈkofskəjə]; Ukrainian: Ганна Степанівна Політковська, IPA: [ˈɦɑnːɐ steˈpɑn⁽ʲ⁾iu̯nɐ pol⁽ʲ⁾itˈkɔu̯sʲkɐ]; née Mazepa, Мазепа, IPA: [mɐˈzɛpɐ]; 30 August 1958 – 7 October 2006) was a Russian journalist, and human rights activist, who reported on political events in Russia, in particular, the Second Chechen War (1999–2005).

It was her reporting from Chechnya that made Politkovskaya's national and international reputation. For seven years, she refused to give up reporting on the war despite numerous acts of intimidation and violence. Politkovskaya was arrested by Russian military forces in Chechnya and subjected to a mock execution. She was poisoned while flying from Moscow via Rostov-on-Don to help resolve the 2004 Beslan school hostage crisis, and had to turn back, requiring careful medical treatment in Moscow to restore her health.

Her post-1999 articles about conditions in Chechnya were turned into books several times; Russian readers' main access to her investigations and publications was through Novaya Gazeta, a Russian newspaper that featured critical investigative coverage of Russian political and social affairs. From 2000 onwards, she received numerous international awards for her work. In 2004, she published Putin's Russia, a personal account of Russia for a Western readership.

On 7 October 2006, she was murdered in the elevator of her block of apartments, an assassination that attracted international attention. In June 2014, five men were sentenced to prison for the murder, but it is still unclear who ordered or paid for the contract killing.

🔗 United States 🔗 Computing 🔗 Computing/Computer hardware 🔗 Computing/Early computers 🔗 United States/Iowa

The Atanasoff–Berry computer (ABC) was the first automatic electronic digital computer. Limited by the technology of the day, and execution, the device has remained somewhat obscure. The ABC's priority is debated among historians of computer technology, because it was neither programmable, nor Turing-complete. Conventionally, the ABC would be considered the first electronic ALU (arithmetic logic unit) – which is integrated into every modern processor's design.

Its unique contribution was to make computing faster by being the first to use vacuum tubes to do the arithmetic calculations. Prior to this, slower electro-mechanical methods were used by Konrad Zuse's Z1, and the simultaneously developed Harvard Mark I. The first electronic, programmable, digital machine, the Colossus computer from 1943 to 1945, used similar tube-based technology as ABC.

🔗 Mathematics 🔗 Astronomy

Gauss's Pythagorean right triangle proposal is an idea attributed to Carl Friedrich Gauss for a method to signal extraterrestrial beings by constructing an immense right triangle and three squares on the surface of the Earth. The shapes would be a symbolic representation of the Pythagorean theorem, large enough to be seen from the Moon or Mars.

Although credited in numerous sources as originating with Gauss, with exact details of the proposal set out, the specificity of detail, and even whether Gauss made the proposal, have been called into question. Many of the earliest sources do not actually name Gauss as the originator, instead crediting a "German astronomer" or using other nonspecific descriptors, and in some cases naming a different author entirely. The details of the proposal also change significantly upon different retellings. Nevertheless, Gauss's writings reveal a belief and interest in finding a method to contact extraterrestrial life, and that he did, at the least, propose using amplified light using a heliotrope, his own 1818 invention, to signal supposed inhabitants of the Moon.

🔗 Computing 🔗 Computing/Computer hardware

The Dadda multiplier is a hardware binary multiplier design invented by computer scientist Luigi Dadda in 1965. It uses a selection of full and half adders to sum the partial products in stages (the Dadda tree or Dadda reduction) until two numbers are left. The design is similar to the Wallace multiplier, but the different reduction tree reduces the required number of gates (for all but the smallest operand sizes) and makes it slightly faster (for all operand sizes).

Dadda and Wallace multipliers have the same three steps for two bit strings ${\displaystyle w_{1}}$ and ${\displaystyle w_{2}}$ of lengths ${\displaystyle \ell _{1}}$ and ${\displaystyle \ell _{2}}$ respectively:

1. Multiply (logical AND) each bit of ${\displaystyle w_{1}}$, by each bit of ${\displaystyle w_{2}}$, yielding ${\displaystyle \ell _{1}\cdot \ell _{2}}$ results, grouped by weight in columns
2. Reduce the number of partial products by stages of full and half adders until we are left with at most two bits of each weight.
3. Add the final result with a conventional adder.

As with the Wallace multiplier, the multiplication products of the first step carry different weights reflecting the magnitude of the original bit values in the multiplication. For example, the product of bits ${\displaystyle a_{n}b_{m}}$ has weight ${\displaystyle n+m}$.

Unlike Wallace multipliers that reduce as much as possible on each layer, Dadda multipliers attempt to minimize the number of gates used, as well as input/output delay. Because of this, Dadda multipliers have a less expensive reduction phase, but the final numbers may be a few bits longer, thus requiring slightly bigger adders.

🔗 Technology 🔗 Linguistics 🔗 Japan 🔗 Japan/Science and technology 🔗 Japan/CJKV

Mojibake (Japanese: 文字化け; IPA: [mod͡ʑibake]) is the garbled text that is the result of text being decoded using an unintended character encoding. The result is a systematic replacement of symbols with completely unrelated ones, often from a different writing system.

This display may include the generic replacement character ("�") in places where the binary representation is considered invalid. A replacement can also involve multiple consecutive symbols, as viewed in one encoding, when the same binary code constitutes one symbol in the other encoding. This is either because of differing constant length encoding (as in Asian 16-bit encodings vs European 8-bit encodings), or the use of variable length encodings (notably UTF-8 and UTF-16).

Failed rendering of glyphs due to either missing fonts or missing glyphs in a font is a different issue that is not to be confused with mojibake. Symptoms of this failed rendering include blocks with the code point displayed in hexadecimal or using the generic replacement character. Importantly, these replacements are valid and are the result of correct error handling by the software.