Researchers in Japan have developed a plastic that dissolves in seawater within hours, offering up a potential solution for a modern-day scourge polluting oceans and harming wildlife. From a report: While scientists have long experimented with biodegradable plastics, researchers from the RIKEN Center for Emergent Matter Science and the University of Tokyo say their new material breaks down much more quickly and leaves no residual trace. At a lab in Wako city near Tokyo, the team demonstrated a small piece of plastic vanishing in a container of salt water after it was stirred up for about an hour. While the team has not yet detailed any plans for commercialisation, project lead Takuzo Aida said their research has attracted significant interest, including from those in the packaging sector.

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Japanese police referred five individuals and a company to prosecutors last week for allegedly operating a website that published detailed movie plots without permission from rights holders. The Miyagi Prefectural Police Headquarters and Minamisanriku Police Station sent the case to the Sendai District Public Prosecutors Office on suspicion of violating the Copyright Act. The Content Overseas Distribution Association described the case as having "very few precedents for a corporation being referred to the prosecutor's office on suspicion of violating the Copyright Act, making this an extremely rare case." The website posted detailed content from films including "Godzilla Minus One" and four others copyrighted by Toho, "Shin Kamen Rider" and two others by Toei, "Neck" and one other by KADOKAWA, and "Shin Ultraman" by Tsuburaya Productions. The site listed more than 8,000 films with complete storylines, character names, dialogue, and scene descriptions.

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Japan Post has launched a "digital address" system that links seven-digit combinations of numbers and letters to physical addresses. From a report: Under the system, users can input these seven-digit codes on online shopping websites, and their addresses will automatically appear on the sites. People can obtain digital addresses by registering with Japan Post's Yu ID membership service. Their digital addresses will not change even if their physical addresses change. Their new addresses will be linked to the codes if they submit notices of address changes.

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An anonymous reader shares a report: [Last] week, it was announced that Docomo's emoji designs will no longer appear on any of the Japanese mobile network's devices. This marks the end of an emoji era that first began in 1999, even though the set hasn't been updated since 2013. [...] Unlike these earlier systems, Docomo's emoji set in 1999 was explicitly tied to mobile internet use and would become the template for emoji standardization in the 2000s and 2010s, alongside emoji design sets implemented by Softbank and KDDI on their own versions of i-mode (J-Sky and EZweb, respectively). Docomo's set would receive several updates between 1999 and 2013, introducing color support and additional concepts to the keyboard. But now, as per this week's announcement, it will finally be discontinued. Spanning 26 years, it's undeniable that Docomo's emoji set played a foundational role in emoji history, even if its last incarnation remained unchanged for almost 12 of those 26 years.

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An interesting piece on Construction Physics that examines how Japan transformed discarded American wartime shipbuilding techniques into a revolutionary manufacturing system that captured nearly half the global market by 1970. The story reveals the essential ingredients for industrial dominance: government backing, organizational alignment, relentless will to improve, and the systematic coordination needed to turn existing technologies into something entirely new. A few excerpts: During WWII, the US constructed an unprecedented shipbuilding machine. By assembling ships from welded, prefabricated blocks, the US built a huge number of cargo ships incredibly quickly, overwhelming Germany's u-boats and helping to win the war. But when the war was over, this shipbuilding machine was dismantled. Industrialists like Henry Kaiser and Stephen Bechtel, who operated some of the US's most efficient wartime shipyards, left the shipbuilding business. Prior to the war, the US had been an uncompetitive commercial shipbuilder producing a small fraction of commercial oceangoing ships, and that's what it became again. At the height of the war the US was producing nearly 90% of the world's ships. By the 1950s, it produced just over 2%. But the lessons from the US's shipbuilding machine weren't forgotten. After the war, practitioners brought them to Japan, where they would continue to evolve, eventually allowing Japan to build ships faster and cheaper than almost anyone else in the world. [...] The third strategy that formed the core of modern shipbuilding methods was statistical process control. The basic idea behind process control is that it's impossible to make an industrial process perfectly reliable. There will always be some variation in what it produces: differences in part dimensions, material strength, chemical composition, and so on. But while some variation is inherent to the process (and must be accepted), much of the variation is from specific causes that can be hunted down and eliminated. By analyzing the variation in a process, undesirable sources of variation can be removed. This makes a process work more reliably and predictably, reducing waste and rework from parts that are outside acceptable tolerances.

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New research suggests Oda Ujiharu, long derided as feudal Japan's most ineffective military leader, may have been mischaracterized. The Sengoku-period daimyo, who ruled from Oda Castle in present-day Ibaraki Prefecture, lost his fortress an unprecedented nine times to rival clans -- but recaptured it eight times, often with inferior forces. "His refusal to accept defeat and his iron will to get up and keep fighting is why many historians reject the 'weakest samurai warlord' nickname and instead refer to him as 'The Phoenix,'" notes the research published in Tokyo Weekender. While Ujiharu's battlefield decisions appear strategically baffling -- repeatedly abandoning castle defenses for open combat -- some researchers propose these actions were deliberately taken to protect peasant settlements from the devastation of prolonged sieges. From the article: Ujiharu's blind charges may actually have had a noble purpose. Japanese battles involving castles almost always turned into sieges, and those always ended the same way: with the nearby fields and peasant settlements being either destroyed to try and draw the lord out of the castle or looted to feed the occupying army. Some researchers believe that Ujiharu was trying to avoid a siege to save his subjects. Despite numerous military setbacks, Ujiharu maintained remarkable loyalty from his subordinates. Historical records indicate that after his initial campaigns, attempts to bribe or threaten his retainers to defect consistently failed. The daimyo demonstrated considerable diplomatic acumen, forming multiple alliances with former enemies throughout his career. His downfall came only after hesitating to pledge allegiance to Toyotomi Hideyoshi during Japan's unification, resulting in his lands being confiscated.

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