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Printer

The World's First Village of Affordable 3D-Printed Homes Is Now Complete (dwell.com) 102

MikeChino shares a report from Dwell: In Tabasco, Mexico, a family living below the poverty line recently visited their future home: a 3D-printed, 500-square foot structure with two bedrooms, one bath, a wraparound cement patio, and an awning over the front porch. It's one of two fully furnished homes -- printed in about 24 hours and finished by local nonprofit ECHALE -- that will soon make up a larger community of 50 dwellings with green spaces, parks, amenities, and basic utilities. Tabasco is a seismic zone, so the homes were engineered beyond standard safety requirements -- and they'll endure for generations. "Icon's printer, called the Vulcan II, isn't the first designed to build an entire house," notes Fast Company. "But the new Mexican neighborhood, which will have 50 of the homes, will be the first community to use this type of technology at scale."

New Story, the nonprofit leading the project, has posted a video about the homes on their YouTube channel.
Printer

Ask Slashdot: Will We Ever Be Able To Make Our Own Computer Hardware At Home? 117

dryriver writes: The sheer extent of the data privacy catastrophe happening -- everything software/hardware potentially spies on us, and we don't get to see what is in the source code or circuit diagrams -- got me thinking about an intriguing possibility. Will it ever be possible to design and manufacture your own CPU, GPU, ASIC or RAM chip right in your own home? 3D printers already allow 3D objects to be printed at home that would previously have required an injection molding machine. Inkjet printers can do high DPI color printouts at home that would previously have required a printing press. Could this ever happen for making computer hardware? A compact home machine that can print out DIY electronic circuits right in your home or garage? Could this machine look a bit like a large inkjet printer, where you load the electronics equivalent of "premium glossy photo paper" into the printer, and out comes a printed, etched, or otherwise created integrated circuit that just needs some electricity to start working? If such a machine or "electronics printer" is technically feasible, would the powers that be ever allow us to own one?
Open Source

Open-Source Security Nonprofit Tries Raising Money With 'Hacker-Themed' T-Shirts (ostif.org) 11

The nonprofit Open Source Technology Improvement Fund connects open-source security projects with funding and logistical support. (Launched in 2015, the Illinois-based group includes on its advisory council representatives from DuckDuckGo and the OpenVPN Project.)

To raise more money, they're now planning to offer "hacker-themed swag" and apparel created with a state-of-the art direct-to-garment printer -- and they're using Kickstarter to help pay for that printer: With the equipment fully paid for, we will add a crucial revenue stream to our project so that we can get more of our crucial work funded. OSTIF is kicking-in half of the funding for the new equipment from our own donated funds from previous projects, and we are raising the other half through this KickStarter. We have carefully selected commercial-grade equipment, high quality materials, and gathered volunteers to work on the production of the shirts and wallets.
Pledges of $15 or more will be rewarded with an RFID-blocking wallet that blocks "drive-by" readers from scanning cards in your pocket, engraved with the message of your choice. And donors pledging $18 or more get to choose from their "excellent gallery" of t-shirts. Dozens of artists have contributed more than 40 specially-commissioned "hacker-themed" designs, including "Resist Surveillance" and "Linux is Communism" (riffing on a 2000 remark by Microsoft's CEO Steve Ballmer).

There's also shirts commemorating Edward Snowden (including one with an actual NSA document leaked by Edward Snowden) as well as a mock concert t-shirt for the "world tour" of the EternalBlue exploit listing locations struck after it was weaponized by the NSA. One t-shirt even riffs on the new millennial catchphrase "OK boomer" -- replacing it with the phrase "OK Facebook" using fake Cyrillic text.

And one t-shirt design shows an actual critical flaw found by the OSTIF while reviewing OpenVPN 2.4.0.

So far they have 11 backers, earning $790 of their $45,000 goal.
Science

Wild Silkworms Produce Proteins Primed for Bioprinting (scientificamerican.com) 9

A mix of silkworms' proteins acts as a scaffold for 3-D-printed tissues and organs. From a report: Many research groups are testing "ink" made from silk proteins to print human tissues, implants and perhaps even organs. The process is a less costly alternative to conventional 3-D printing with collagen, a key protein in the body's natural scaffolding. Researchers in Assam, a state in India, are investigating using local silkworm species for the task -- they recently submitted a patent for bioinks using a combination of proteins extracted from local species Antheraea assamensis and Samia ricini, as well as the commonly used Bombyx mori. The scientists have woven them into synthetic structures ranging from blood vessels to liver lobes; in a paper published in September in ACS Applied Materials & Interfaces, they described mimicking the cartilage of an entire ear. Silk is a natural polymer, a substance with long, repeating molecular chains. It is mechanically strong and completely biodegradable, well suited for applications in tissue engineering.

To use it, researchers draw liquid silk from the silkworm's glands or dissolve silk fibers in solvents. They carefully mix the gelatinous liquid with a patient's stem cells, then build structures layer by layer with a 3-D printer. After implantation, the cells grow and replace the silken scaffold, which eventually degenerates into amino acids. Extracting and purifying collagen from animal remains, a common medical source, is complex and expensive. "Compared with collagen, silks have an immense advantage in terms of supply and processing. Local sourcing is also a clear plus in their use in India," says David Kaplan, who heads the department of biomedical engineering at Tufts University and is not involved in the new research. Silk from domesticated silkworms has been used widely in bioprinting, but Biman B. Mandal's laboratory at the Indian Institute of Technology Guwahati in Assam is among the first to incorporate wild silks.

Printer

Google Is Terminating Google Cloud Print (9to5google.com) 64

Google has announced that Cloud Print, its cloud-based printing solution, is being retired at the end of next year. 9to5Google reports: The announcement comes in the form of a support document for Cloud Print that popped up recently, which is kind enough to remind us that Cloud Print has technically been in beta since it launched a decade ago: "Cloud Print, Google's cloud-based printing solution that has been in beta since 2010, will no longer be supported as of December 31, 2020. Beginning January 1, 2021, devices across all operating systems will no longer be able to print using Google Cloud Print. We recommend that over the next year, you identify an alternative solution and execute a migration strategy."

Google notes that Chrome OS' native printing solutions have been vastly improved since Cloud Print launched in 2010, and also promises that native printing in Chrome OS will continue to get more features over time: "Google has improved the native printing experience for Chrome OS, and will continue adding features to native printing. For environments besides Chrome OS, or in multi-OS scenarios, we encourage you to use the respective platform's native printing infrastructure and/or partner with a print solutions provider."

Printer

New Micro 3D Printing Technology Wins Prestigious NZ Engineering Award (callaghaninnovation.govt.nz) 18

Long-time Slashdot reader ClarkMills quotes New Zealand's Innovation Agency: New 3D printing technology creating highly detailed objects, smaller than a strand of human hair, has won the 2019 ENVI Engineering Innovation Award (Engineering New Zealand Awards). Micromaker3D, powered by breakthrough Laminated Resin Printing (LRP), makes it easy and more accessible to create detailed submillimetre structures for applications such as sensors, wearables, point-of-care diagnostics, micro-robotics or aerospace components.... LRP enables the printing of submillimetre structures with complex geometries of up to 100 per cent density, in extraordinary low-layer thicknesses and with imaging speeds as quick as one second per layer independent of complexity or density...

The judges saw MicroMaker3D as a gamechanger and believe it will spark many other innovations... The ENVI Engineering Innovation Award category is described as: "A breathtakingly clever engineering project or product that has solved an age-old problem or shifted from the 'always done this way' mentality...."

Callaghan Innovation is working to take the technology global, from the development and demonstration phase to commercial reality...

Lead engineer Neil Glasson points out that while a human hair is about 100 microns in width, "we're looking at five-micron resolution."
HP

Xerox Considers Cash-and-Stock Offer For HP (cnbc.com) 43

According to The Wall Street Journal, Xerox is considering making a cash-and-stock offer for HP (Source paywalled; alternative source), which has a market value of about $27 billion. From the report: There is no guarantee Xerox will follow through with an offer or that one would succeed. HP, which installed a new chief executive just last week, is more than three times the size of Xerox and any bid would be at a premium to its current stock price, the people said. Working in Xerox's favor: It expects a $2.3 billion windfall from a deal to sell stakes in joint ventures with Fujifilm Holdings Corp., which was announced Tuesday along with the dismissal of a $1 billion-plus lawsuit filed against Xerox by the Japanese technology company. Xerox has also received an informal funding commitment from a major bank, known as a "highly confident letter," the people said.

A deal would join two household names with storied pasts that have been scrambling to retool their businesses as the need for printed documents declines. Both companies are in cost-cutting mode and a union could afford new opportunities to shed expenses -- to the tune of more than $2 billion, the people said.

Businesses

Startup That Aims To 3D-Print Rockets Says It's Fully Funded For Its First Commercial Missions (theverge.com) 73

Aerospace startup Relativity Space -- the company that aims to launch the first fully 3D-printed rocket to orbit -- says it has raised all of the money it needs to launch its first mission and then enter commercial operations as early as 2021. After raising $140 million in its latest funding round, Relativity says its total funding now equals $185 million, which is enough money to carry the company through its first flights over the next couple of years. The Verge reports: Started by former engineers at Blue Origin and SpaceX, Relativity has grand ambitions to create all of its vehicles -- from the engines to the fuselage -- using 3D printing almost exclusively. The goal is to overhaul how rockets have been built for the last 50 years by taking people out of the manufacturing process and automating almost everything. By building rockets this way, Relativity claims it can drastically cut down costs by requiring fewer parts per rocket. Eventually, the company hopes to replicate this 3D-printing process on another world, like Mars, creating a rocket that can take off from the planet and return to Earth.

Right now, the company is focusing on its first rocket, the Terran 1, a small- to medium-sized vehicle being built with Relativity's specialized Stargate 3D printers in Los Angeles. Relativity says these updated printers could eventually create a Terran 1 rocket in less than 60 days from raw material. "Those are actually twice the print size of the prior version, and we have several of those already up and operational," says [Relativity Space CEO Tim Ellis] of the updated printers. Designed to stand about 100 feet tall, the Terran 1 rocket will be able to carry up to 2,755 pounds (1,250 kilograms) of payload, which is just 6 percent of the capacity of SpaceX's Falcon 9 rocket. However, the company says it has increased the size of the vehicle's nose cone, or payload fairing, making it able to hold twice the volume as originally planned.

Printer

HP Printers Try To Send Data Back To HP About Your Devices and What You Print (robertheaton.com) 143

Robert Heaton: Last week my in-laws politely but firmly asked me to set up their new HP printer. I protested that I'm completely clueless about that sort of thing, despite my tax-return-job-title of "software engineer." Still remonstrating, I was gently bundled into their study with an instruction pamphlet, a cup of tea, a promise to unlock the door once I'd printed everyone's passport forms, and a warning not to try the window because the roof tiles are very loose. At first the setup process was so simple that even a computer programmer could do it. But then, after I had finished removing pieces of cardboard and blue tape from the various drawers of the machine, I noticed that the final step required the downloading of an app of some sort onto a phone or computer. This set off my crapware detector.

[...] It was a way to try and get people to sign up for expensive ink subscriptions and/or hand over their email addresses, plus something even more nefarious that we'll talk about shortly (there were also some instructions for how to download a printer driver tacked onto the end). This was a shame, but not unexpected. I'm sure that the HP ink department is saddled with aggressive sales quotas, and no doubt the only way to hit them is to ruthlessly exploit people who don't know that third-party cartridges are just as good as HP's and are much cheaper. Fortunately, the careful user can still emerge unscathed from this phase of the setup process by gingerly navigating the UI patterns that presumably do fool some people who aren't paying attention.

Robotics

The Next Energy-Efficient Architecture Revolution: A House Built By Robots (qz.com) 54

"Erecting a new building ranks among the most inefficient, polluting activities humans undertake," reports Qz. "The construction sector is responsible for nearly 40% of the world's total energy consumption and CO2 emissions, according to a UN global survey. A consortium of Swiss researchers has one answer to the problem: working with robots."

Over four years, 30 different industry partners joined a team of experts at ETH Zurich university for a cutting-edge "digital fabrication" project: building the DFAB House. Timber beams were assembled by robots on site, it used 60% less cement, and it features some amazing ceilings printed with a large-scale 3D sand printer. "This is a new way of seeing architecture," says Matthias Kohler, a member of DFAB's research team. The work of architects has long been presented in terms of designing inspiring building forms, while the technical specifics of construction has been relegated to the background. Kohler thinks this is quickly changing. "Suddenly how we use resources to build our habitats is at the center of architecture," he argues. "How you build matters."

DFAB isn't the first building project to use digital fabrication techniques. In 2014, Chinese company WinSun demonstrated the architectural potential of 3D printing by manufacturing 10 single-story houses in one day. A year later, the Shanghai-based company also printed an apartment building and a neoclassical mansion, but these projects remain in the development phase. Kohler explains that beating construction speed records wasn't necessarily their goal. "Of course we're interested in gaining breakthroughs in speed and economy, but we tried to hold to the idea of quality first," he says. "You can do things very, very fast but that doesn't mean that it's actually sustainable...."

Beyond the experimental structure in Switzerland, Kohler and Dillenburger explain that they're interested in fostering a dialogue with the global architecture and construction sectors. They've published their open-source data sets and have organized a traveling exhibition titled "How to Build a House: Architectural Research in the Digital Age," opening at the Cooper Union in New York this week.

Science

Objects Can Now Change Colors Like a Chameleon (techxplore.com) 21

The color-changing capabilities of chameleons have long bewildered willing observers. While humans can't yet camouflage much beyond a green outfit to match grass, inanimate objects are another story. From a report: A team from MIT's Computer Science and Artificial Intelligence Laboratory (CSAIL) has brought us closer to this chameleon reality, by way of a new system that uses reprogrammable ink to let objects change colors when exposed to ultraviolet (UV) and visible light sources. Dubbed "PhotoChromeleon," the system uses a mix of photochromic dyes that can be sprayed or painted onto the surface of any object to change its color -- a fully reversible process that can be repeated infinitely. PhotoChromeleon can be used to customize anything from a phone case to a car, or shoes that need an update. The color remains, even when used in natural environments. "This special type of dye could enable a whole myriad of customization options that could improve manufacturing efficiency and reduce overall waste," says CSAIL postdoc Yuhua Jin, the lead author on a new paper about the project. "Users could personalize their belongings and appearance on a daily basis, without the need to buy the same object multiple times in different colors and styles."

PhotoChromeleon builds off of the team's previous system, "ColorMod," which uses a 3-D printer to fabricate items that can change their color. Frustrated by some of the limitations of this project, such as small color scheme and low-resolution results, the team decided to investigate potential updates. With ColorMod, each pixel on an object needed to be printed, so the resolution of each tiny little square was somewhat grainy. As far as colors, each pixel of the object could only have two states: transparent and its own color. So, a blue dye could only go from blue to transparent when activated, and a yellow dye could only show yellow. But with PhotoChromeleon's ink, you can create anything from a zebra pattern to a sweeping landscape to multicolored fire flames, with a larger host of colors.

HP

HP Names Head of Printer Division As New CEO (pplware.sapo.pt) 27

Longtime HP veteran Enrique Lores, who runs the $20 billion printer business, is succeeding Dion Weisler effective November 1. Weisler, who was named CEO in late 2014 after the computing behemoth was split into two companies, is returning to Australia for a "family health matter." He will remain on the company's board. MarketWatch reports: Lores, a native of Spain who started his 30-year career as an intern, vowed to "simplify" and "evolve" the company's business model during a conference call with analysts following the earnings release. The executive change comes amid wrenching changes -- and turmoil -- in the PC market, raising the question of where the market is headed for the rest of the year.
Crime

Alexa, Siri, and Google Home Can Be Tricked Into Sending Callers To Scam Phone Numbers (bbb.org) 14

"Don't ask your smart device to look up a phone number, because it may accidentally point you to a scam," warn the consumer watchdogs at the Better Business Bureau: You need the phone number for a company, so you ask your home's smart device -- such as Google Home, Siri, or Alexa -- to find and dial it for you. But when the company's "representative" answers, the conversation takes a strange turn. This representative has some odd advice! They may insist on your paying by wire transfer or prepaid debit card. In other cases, they may demand remote access to your computer or point you to an unfamiliar website.

Turns out, that this "representative" isn't from the company at all. Scammers create fake customer service numbers and bump them to the top of search results, often by paying for ads. When Siri, Alexa, or another device does a voice search, the algorithm may accidentally pick a scam number.

One recent victim told BBB.org/ScamTracker that she used voice search to find and call customer service for a major airline. She wanted to change her seat on an upcoming flight, but the scammer tried to trick her into paying $400 in pre-paid gift cards by insisting the airline was running a special promotion. In another report, a consumer used Siri to call what he thought was the support number for his printer. Instead, he found himself in a tech support scam.

People put their faith in voice assistants, even when they're just parroting the results from search engines, the BBB warns. The end result?

"Using voice search to find a number can make it harder to tell a phony listing from the real one."
Security

Microsoft Catches Russian State Hackers Using IoT Devices To Breach Networks (arstechnica.com) 99

An anonymous reader quotes a report from Ars Technica: Hackers working for the Russian government have been using printers, video decoders, and other so-called Internet-of-things devices as a beachhead to penetrate targeted computer networks, Microsoft officials warned on Monday. "These devices became points of ingress from which the actor established a presence on the network and continued looking for further access," officials with the Microsoft Threat Intelligence Center wrote in a post. "Once the actor had successfully established access to the network, a simple network scan to look for other insecure devices allowed them to discover and move across the network in search of higher-privileged accounts that would grant access to higher-value data."

Microsoft researchers discovered the attacks in April, when a voice-over-IP phone, an office printer, and a video decoder in multiple customer locations were communicating with servers belonging to "Strontium," a Russian government hacking group better known as Fancy Bear or APT28. In two cases, the passwords for the devices were the easily guessable default ones they shipped with. In the third instance, the device was running an old firmware version with a known vulnerability. While Microsoft officials concluded that Strontium was behind the attacks, they said they weren't able to determine what the group's ultimate objectives were.
Microsoft says they have notified the makers of the targeted IoT devices so they can add new protections. "Monday's report also provided IP addresses and scripts organizations can use to detect if they have also been targeted or infected," adds Ars Technica. "Beyond that, Monday's report reminded people that, despite Strontium's above-average hacking abilities, an IoT device is often all it needs to gain access to a targeted network."
Technology

Amazon Is Going To Kill Your Dash Button 40

Amazon said Thursday that it will turn off the capabilities of all its Dash buttons worldwide on August 31st. "The decision follows Amazon's move in February to stop selling new buttons," reports CNET. "At the time, the company let folks with existing Dash buttons continue to order stuff with them, but an Amazon spokesperson said usage "has significantly slowed" since then, resulting in the company pulling the plug completely on the program. CNET reports: The Dash button, the ultimate single-use device, lets you buy an item on Amazon with one click. [...] Amazon has replaced the physical buttons with virtual Dash buttons on its website, which will continue to be available. The company said it's seen growth in other options, too, such as voice shopping through Alexa as well as Dash Replenishment Service, which allows appliances to automatically reorder items like printer ink when they're running low. Subscribe & Save is another popular option that should help fill the shopping void left for any longtime Dash button enthusiasts. While those buttons will no longer work by month's end, folks will notice Dash's core concept of more seamless shopping remains alive in just about every smart home.
Printer

First E-Bikes, Then Flying Cars: a Do-Anything 3D Printing Tech (ieee.org) 45

Tekla Perry shares an interesting story from the IEEE's "View from the Valley" blog: Arevo was aiming to get into the aircraft parts business when it started developing software and hardware to print 3D structures using a composite containing continuous carbon fibers. Its technology lays out the lines of the material in ways to maximize strength and minimize the amount of composite used.

Printing out a bike frame? That was just going to be a demo for investors. Now the company is in the e-bike manufacturing business, but thinks the ultimate application of its technology will be flying cars.

That's not a joke, the article explains: Bheda says the flying car market could turn out to be Arevo's sweet spot. "They will be manufactured in a larger volume than airplanes, the manufacturing technology being used for current aircraft won't scale to that, and they want to use thermoplastic. Our technology is at least three years ahead of any other thermoplastic technology, so we will be ready."
They're now marketing their in-house printing capabilities as a service, "keeping the manufacture of any products in house."
NASA

NASA Funds Company To 3D-Print Spacecraft Parts in Orbit (engadget.com) 28

An anonymous reader quotes Engadget: NASA is expanding its efforts to bring 3D printing to space. The agency has given Made In Space a $73.3 million contract to demonstrate the ability to 3D-print spacecraft parts in orbit using Archinaut One, a robotic manufacturing ship due to launch in 2022 or later. The vessel will fly aboard a Rocket Lab Electron rocket and 3D-print two 32-foot beams on each side, with each unfurling two solar arrays. The completed arrays could produce up to five times more power than the solar panels you normally find on spacecraft this size, NASA said...

If successful, it could alter how NASA and others approach building and fixing spacecraft. This could lead to building spacecraft (albeit smaller ones at this stage) in orbit, of course, but it could also let space agencies launch small satellites that receive large power collectors once they're floating above Earth. It could also lead to fewer spacewalks by having robots build items that would otherwise require human involvement.

Printer

Scientists 3D-Print Human Skin and Bone For Mars Astronauts (cnet.com) 39

Scientists from the University Hospital of Dresden Technical University in Germany have successfully bio-printed skin and bone samples upside down to help determine if the method could be used in a low-gravity environment. CNET reports: The skin sample was printed using human blood plasma as a "bio ink." The researchers added plant and algae-based materials to increase the viscosity so it wouldn't just fly everywhere in low gravity. "Producing the bone sample involved printing human stem cells with a similar bio-ink composition, with the addition of a calcium phosphate bone cement as a structure-supporting material, which is subsequently absorbed during the growth phase," said Nieves Cubo, a bioprinting specialist at the university. These samples are just the first steps for the ESA's ambitious 3D bio-printing project, which is investigating what it would take to equip astronauts with medical and surgical facilities to help them survive and treat injuries on long spaceflights and on Mars.
Communications

The Invention of USB, 'The Port That Changed Everything' (fastcompany.com) 231

harrymcc shares a Fast Company article about "the generally gnarly process once required to hook up peripherals" in the late 1990s -- and one Intel engineer who saw the need for "one plug to rule them all." In the olden days, plugging something into your computer -- a mouse, a printer, a hard drive -- required a zoo of cables. Maybe you needed a PS/2 connector or a serial port, the Apple Desktop Bus, or a DIN connector; maybe a parallel port or SCSI or Firewire cable. If you've never heard of those things, and if you have, thank USB.

When it was first released in 1996, the idea was right there in the first phrase: Universal Serial Bus. And to be universal, it had to just work. "The technology that we were replacing, like serial ports, parallel ports, the mouse and keyboard ports, they all required a fair amount of software support, and any time you installed a device, it required multiple reboots and sometimes even opening the box," says Ajay Bhatt, who retired from Intel in 2016. "Our goal was that when you get a device, you plug it in, and it works."

It was at Intel in Oregon where engineers made it work, at Intel where they drummed up the support of an industry that was eager to make PCs easier to use and ship more of them. But it was an initial skeptic that first popularized the standard: in a shock to many geeks in 1998, the Steve Jobs-led Apple released the groundbreaking first iMac as a USB-only machine. The faster speeds of USB 2.0 gave way to new easy-to-use peripherals too, like the flash drive, which helped kill the floppy disk and the Zip drive and CD-Rs. What followed was a parade of stuff you could plug in: disco balls, head massagers, security keys, an infinity of mobile phone chargers. There are now by one count six billion USB devices in the world.

The article includes a thorough oral history of USB's development, and points out there's now also a new reversible Type-C cable design. And USB4, coming later this year, "will be capable of achieving speeds upwards of 40Gbps, which is over 3,000 times faster than the highest speeds of the very first USB."

"Bhatt couldn't have imagined all of that when, as a young engineer at Intel in the early '90s, he was simply trying to install a multimedia card."
Programming

Software Executive Decries 'Toxic Certainty Syndrome' (glowforge.com) 217

Michael Natkin is the VP of software engineering at the 3D printer company Glowforge. In a recent post on the company blog, he argues that the tech industry has "glorified overconfidence" with its philosophy of "strong opinions, loosely held": The idea of strong opinions, loosely held is that you can make bombastic statements, and everyone should implicitly assume that you'll happily change your mind in a heartbeat if new data suggests you are wrong. It is supposed to lead to a collegial, competitive environment in which ideas get a vigorous defense, the best of them survive, and no one gets their feelings hurt in the process. On a certain kind of team, where everyone shares that ethos, and there is very little power differential, this can work well. I've had the pleasure of working on teams like that, and it is all kinds of fun...

Unfortunately, that ideal is seldom achieved. What really happens? The loudest, most bombastic engineer states their case with certainty, and that shuts down discussion. Other people either assume the loudmouth knows best, or don't want to stick out their neck and risk criticism and shame. This is especially true if the loudmouth is senior, or there is any other power differential... Even if someone does have the courage to push back, in practice the original speaker isn't likely to be holding their opinion as loosely as they think. Having stated their case, they are anchored to it and will look for evidence that confirms it and reject anything contradictory. It is a natural tendency to want to win the argument and be the smartest person in the room.

As a fix, he suggests adding a degree of uncertainty to statements -- which makes it easier for you to adjust them later while also explicitly encouraging feedback.

For example, in announcing the blog post on Twitter, Natkin wrote that "I'm about 60% sure it's useful."

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