Is *How To* by Randall Munroe worth reading?

Yes—*How To* delivers laugh-out-loud scenarios grounded in real science, from building lava moats to powering Martian homes. While less consistently hilarious than Munroe’s *What If?*, it remains a clever, engaging read for curious minds.

What scientific concepts are explored in *How To*?

Munroe tackles orbital mechanics (emergency landings), thermodynamics (boiling rivers), renewable energy (wind-powered Mars homes), and theoretical physics (faster-than-light travel). Each concept is twisted into absurd yet logical solutions for mundane tasks.

How does Randall Munroe approach problem-solving in *How To*?

He starts with a simple goal (e.g., digging a hole) and escalates it using extreme science—like calculating the energy required to vaporize a river or designing a house that harnesses Martian winds. The result is a mix of satire and genuine scientific analysis.

What is the most absurd solution proposed in *How To*?

Constructing a lava moat for home security, which involves melting bedrock, containing molten rock, and managing lethal heat levels—a hilariously impractical alternative to traditional alarm systems.

How does *How To* compare to Munroe’s *What If?*?

*What If?* answers absurd questions with serious science, while *How To* offers absurd solutions to ordinary problems. Both use humor and physics but invert the premise, appealing to similar audiences with fresh scenarios.

Can *How To* help improve real-world problem-solving skills?

Indirectly—by demonstrating extreme applications of scientific principles, Munroe encourages creative thinking. Readers learn to break down complex problems, even if his solutions (like relocating via soccer team) aren’t practical.

How To: Absurd Scientific Advice for Common Real-World Problems book cover

How To Summary

Q: What is *How To: Absurd Scientific Advice for Common Real-World Problems* about?

Randall Munroe’s *How To* blends humor and science to solve everyday problems through ludicrously over-engineered solutions, like landing planes from the outside or boiling rivers to cross them. It combines xkcd-style wit with real physics, offering both entertainment and unexpected insights into scientific principles.

Q: Who should read *How To: Absurd Scientific Advice for Common Real-World Problems*?

Fans of xkcd, science enthusiasts, and readers who enjoy creative problem-solving will love this book. It’s ideal for anyone seeking a lighthearted yet intellectually stimulating exploration of physics, engineering, and absurdity.

Absurd Scientific Advice for Common Real-World Problems

Randall Munroe

4.17(22338 Reviews)

How To Summary Overview

Randall Munroe's "How To" offers absurdly scientific solutions to everyday problems. When tennis legend Serena Williams swats drones and astronaut Chris Hadfield tackles emergency landings, who knew science could be this entertaining? Prepare to miss appointments - this book makes complexity addictively fun.

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Chapter 1

When Ridiculous Ideas Meet Scientific Rigor

Have you ever wondered what would happen if you tried to jump as high as possible? Or how to build a lava moat around your house? Or perhaps how to power your home by harnessing the energy of a Martian moon? These are the kinds of questions that most of us dismiss as absurd flights of fancy. But not Randall Munroe. As a former NASA roboticist turned webcomic artist (creator of the wildly popular xkcd), Munroe has built a career exploring the intersection of scientific rigor and ridiculous hypotheticals. His book "How To" has become a cultural phenomenon, endorsed by celebrities like Neil deGrasse Tyson and Bill Gates, who called it "a brilliant guide for absurd situations." What makes this book so captivating is how it transforms seemingly silly questions into opportunities for genuine scientific exploration, using precise calculations and expert consultations to reveal fascinating insights about how our world works.

Chapter 2

The Art of Bad Ideas: Learning Through Failure

Not all ridiculous ideas are created equal. As Munroe points out in his introduction, some seemingly absurd notions-like smearing mold on wounds-have led to revolutionary breakthroughs like penicillin. But most ridiculous ideas are just that: ridiculous. The beauty of exploring these bad ideas, though, is that they can teach us a tremendous amount about how the world works. Historical examples abound: the Wright brothers' numerous failed flying machines, Edison's thousands of unsuccessful light bulb filaments, and even the accidental discovery of artificial sweeteners all emerged from what initially seemed like questionable approaches. Take, for example, the question of how to jump really high. Humans naturally can't jump very far-even professional basketball players only manage about two feet straight up. But what if we really wanted to break records? Munroe explores increasingly complex solutions, from using updrafts (which birds ride like elevators) to wearing wingsuits (which can lower your sink rate from 130 mph to 30 mph). He examines the physics behind each approach, calculating the energy required, the aerodynamic principles involved, and the practical limitations of human physiology. For truly impressive heights, you might try paragliding in specific weather conditions. In 2006, glider pilots Steve Fossett and Einar Enevoldson rode stratospheric mountain waves to over 50,000 feet-almost twice the height of Mt. Everest. This achievement required precise understanding of meteorological conditions, specialized equipment, and careful planning to handle the extreme cold and thin air at such altitudes. This pattern of escalating solutions is characteristic of Munroe's approach. He starts with the obvious, then systematically works through increasingly elaborate possibilities, all while maintaining scientific accuracy. When discussing how to throw a pool party without a pool, he calculates the hoop stress that would burst aluminum foil walls at just 5 inches of water depth, determines that inch-thick wood could hold water 75 feet deep, and even considers the structural properties of Gruyere cheese (which would require two-foot-thick walls). His analysis includes detailed calculations of water pressure, material strength, and structural engineering principles that would typically be found in advanced engineering textbooks. These explorations aren't just entertaining-they're educational. By following the logical progression of increasingly complex solutions, readers learn fundamental principles of physics, engineering, and other scientific disciplines. We discover why some materials work better than others, why certain approaches are impractical, and occasionally, why some ridiculous ideas might actually work. For instance, his examination of makeshift pools reveals important concepts about hydrostatic pressure, material tensile strength, and the relationship between depth and structural requirements. Each failed solution becomes a stepping stone to understanding the underlying scientific principles, much like how real-world research often progresses through a series of refined hypotheses and experiments. The methodology demonstrates how scientific thinking can be applied to even the most outlandish scenarios, teaching readers not just about specific phenomena but about the process of scientific inquiry itself. Through these elaborate thought experiments, Munroe shows how even apparently silly questions can lead to serious scientific insights when approached with rigorous analytical thinking.

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Chapter 3

The Physics of Everyday Impossibilities

One of the most fascinating aspects of "How To" is how it applies rigorous physics to seemingly mundane activities, revealing the hidden complexities and limitations of our physical world. Consider the chapter on how to play the piano. What starts as basic instruction quickly evolves into an exploration of the limits of human hearing and the physics of sound. A standard 88-key piano covers most human hearing (27 Hz to 4,186 Hz), but our hearing actually extends from about 20 Hz to 20,000 Hz. To play all audible notes would require adding 27 keys on the right end and 5 on the left for a 120-key piano. Going further to include frequencies audible to animals like dogs, cats, and bats would require an additional 62 keys, while adding keys for elephant-audible low frequencies and ocean microbaroms would bring the total to 235 keys. This thought experiment isn't just whimsical-it teaches us about the range of sound frequencies in our world and how different species perceive them. It also highlights the engineering challenges of creating instruments for different frequency ranges. For ultrasound, piano strings wouldn't work as the vibrations are too small and fade quickly-piezoelectric crystals would be more effective. For infrasound, impractically long strings would need to be replaced by a rotary woofer with tilting fan blades. Similarly, when exploring how to cross a river, Munroe delves into the physics of different approaches. While jumping across might work for small rivers (a person running at 10 mph can jump about 7 feet), elite long jumpers can reach nearly 30 feet by sprinting over 20 mph. On a bicycle at 30 mph, you could theoretically jump a 60-foot river-but you'd hit the opposite bank at the same speed, likely causing serious injuries. When conventional methods fail, Munroe considers changing the river's state of matter. Freezing a typical river would require about 87 gigawatts of power-equivalent to a heavy-lift rocket at takeoff. Converting a river to steam would require about 300 million electric kettles covering a 2-mile diameter area, drawing roughly as much electricity as the entire rest of the country combined and creating a mushroom cloud visible from space.

Chapter 4

Expert Insights: Learning from Specialists

What elevates "How To" beyond mere speculation is Munroe's commitment to consulting genuine experts across diverse fields. Throughout the book, he demonstrates that even outlandish scenarios can benefit from professional expertise, creating a fascinating blend of practical knowledge and imaginative problem-solving. The chapter on emergency landings stands out, featuring astronaut Chris Hadfield, whose credentials include commanding the International Space Station and piloting over 100 different aircraft types. Hadfield's advice reveals how deep expertise can inform even the most improbable situations. For farmland landings, he provides surprisingly specific guidance: avoid tall crops like mature corn that could catch wings and flip aircraft, seek out freshly planted fields rather than deeply plowed ones that could snag landing gear, and steer clear of commercial operations like sunflower fields or ginseng farms with their hazardous shade structures. As scenarios become more fantastical, Hadfield's responses grow increasingly detailed and entertaining while remaining grounded in aeronautical principles. His advice for landing a passenger jet on an aircraft carrier demonstrates this perfectly: have the carrier turn directly into the wind at maximum speed (typically 30+ knots) to reduce relative landing speed, remove arresting cables that could catastrophically snag civilian landing gear, and utilize every available inch of the flight deck - even suggesting specific approach angles and optimal touchdown points. The Space Shuttle landing in downtown LA scenario (inspired by the movie The Core) showcases Hadfield's ability to apply real-world constraints to fictional situations. He methodically breaks down the challenges: the Shuttle's inflexible landing speed of 185-205 knots, its need for thousands of feet of runway, and its notorious single-attempt landing requirement. He even considers specific street configurations and potential emergency procedures that would be needed. In a particularly creative segment, Hadfield tackles the scenario of escaping a mythical roc bird's clutches by applying hang-gliding principles. He explains weight-shift control techniques, suggesting subtle movements to influence the creature's flight path, while acknowledging the psychological challenge of managing a giant mythical bird: "I don't know what motivates a roc, but every flying thing has patterns and preferences you can work with." The book's expert consultations extend beyond aviation. When exploring anti-drone defenses, Munroe enlists tennis champion Serena Williams for a practical demonstration. While mathematical models suggested 5-7 attempts would be needed to successfully hit a drone, Williams's exceptional skill proved the calculations conservative. On just her third serve, she precisely targeted a DJI Mavic Pro drone, sending it crashing to the court in pieces. Her reaction - "Poor little guy" - adds a humanizing touch to the technical achievement. These expert contributions serve multiple purposes: they validate theoretical calculations, provide practical insights from years of specialized experience, and demonstrate how professional knowledge can be creatively applied to novel situations. Perhaps most importantly, they show that even the most accomplished specialists can approach absurd scenarios with both serious consideration and playful imagination, often revealing unexpected practical applications of their expertise.

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Chapter 5

The Science of Impossible Engineering

Some of the book's most fascinating sections explore engineering challenges that push the boundaries of what's physically possible, revealing the fundamental limits of our technological capabilities. The chapter on building a lava moat illustrates this perfectly. Creating lava is relatively simple in principle-just rocks and heat. Most rocks melt between 800C and 1,200C, achievable with high-temperature furnaces or charcoal forges. But keeping lava molten presents enormous challenges. A lava moat constantly radiates energy through light and infrared radiation, requiring a steady supply of heat to prevent solidification. Munroe calculates that a 900C lava pool radiates roughly 100 kilowatts of heat per square meter. At $0.10 per kilowatt-hour, a one-meter-wide moat enclosing an acre would cost approximately $60,000 per day to maintain. Living inside such a moat creates additional problems-even 10 meters away, standing near a window would exceed firefighter thermal exposure limits. The solution? Running cold water from a nearby spring through your walls, similar to Google's seawater-cooled data center in Finland. When exploring how to power your house, Munroe systematically evaluates every conceivable energy source available on your property. Plants growing on a typical 0.2-acre American lot would generate only about 38 watts-enough to charge a phone but nowhere near enough to power a house. Hydroelectric potential from rainfall is similarly limited. Underground resources like oil, gas, coal, and uranium might theoretically provide power, but extracting them would consume more energy than they'd produce. The most extreme engineering challenge comes when Munroe considers powering a house on Mars. With conventional energy sources unavailable or ineffective, he proposes an audacious solution: a 5,820-kilometer tether attached to Mars's moon Phobos, dangling into Mars's atmosphere. The tether's end would move at Mach 2.3 in the Martian atmosphere, allowing wind turbines to generate 50 megawatts-enough to power an entire town. The catch? This would extract Phobos's orbital energy, causing the moon to slowly spiral inward toward Mars, eventually creating an impact comparable to the asteroid that killed the dinosaurs.

Chapter 6

The Unexpected Practicality of Absurd Questions

While many scenarios in "How To" are deliberately outlandish, they often yield surprisingly practical insights that apply to real-world problems. Munroe's approach of taking ridiculous questions seriously leads to fascinating discoveries about physics, engineering, and the natural world. The chapter on sending files explores the limitations of digital data transfer and the surprising efficiency of physical transportation. For very large amounts of data, physically moving storage devices remains faster than internet transfer - a concept known in computing as "sneakernet." A single suitcase of MicroSD cards contains petabytes of data, often providing higher effective bandwidth than any digital connection. Major tech companies like Amazon even offer physical data transfer services, shipping entire semi-trucks of hard drives when customers need to move massive datasets. For truly remote locations, Munroe considers biological data carriers in a thought experiment that reveals fascinating insights about information density. Monarch butterflies migrate thousands of miles and could theoretically transport tiny storage chips with gigabytes of data. Using DNA-based storage would dramatically increase capacity-ten million tagged monarch butterflies could collectively carry approximately 10 zettabytes, roughly the entire internet's worth of data as of the late 2010s. This exploration highlights both the incredible information density possible with DNA storage and the remarkable navigational abilities of these insects. When discussing how to charge your phone without an outlet, Munroe explores various environmental energy sources that demonstrate the untapped power around us. Running water from household faucets can generate electricity similar to miniature hydroelectric dams. A water supply with 30 PSI pressure and 4 gallons per minute flow can produce over 40 watts-enough to charge dozens of phones. Escalators present another unexpected opportunity-a fully-loaded two-story escalator might output 10 kilowatts of mechanical power when properly harnessed with a paddle wheel system. Even gym equipment could be modified to capture human mechanical energy, with a typical treadmill user generating 100-200 watts during exercise. The chapter on taking selfies transcends simple vanity to reveal practical photography principles about optics and perception. Smartphone cameras typically have wide-angle lenses (around 65 field of view) that create noticeable distortion when taking close-up selfies, making your nose and cheeks appear larger than your ears - an effect known as perspective distortion. The solution involves understanding focal length and distance: hold your phone farther away and zoom in, or use a selfie stick to create distance. This same principle explains why professional portraits are typically shot from 6-8 feet away with longer focal lengths. The chapter even explores the mathematics behind finding the optimal angle for selfie-taking based on facial features and lighting conditions. These seemingly absurd investigations consistently reveal practical applications, from data storage solutions to energy harvesting possibilities, demonstrating how extreme scenarios can illuminate everyday problems in unexpected ways.

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Chapter 7

Time, Space, and the Ultimate Limits of Human Experience

Some of the most profound sections of "How To" explore the fundamental limits of human experience, particularly relating to time and space. These discussions transcend mere problem-solving to touch on deeper philosophical questions about our place in the universe. In "How to Get Somewhere Fast," Munroe establishes that human transportation typically stays under 1 G horizontal acceleration for comfort. At this limit, the fastest possible one-way trip around the world would take 48 minutes. In space, the same limitation would mean reaching the Moon in 4 hours and the inner planets in several days. But what happens if we maintain 1 G acceleration for extended interstellar journeys? This leads to a fascinating exploration of relativistic effects. From your perspective on the spacecraft, nothing unusual happens as you approach light speed-you just continue accelerating. But time slows down for you relative to outside observers. After a subjective 3 years, 10 years pass outside and you travel 10 light-years. After 10 subjective years, you'll travel 15,000 light-years-halfway to the Milky Way's center. If you continue accelerating beyond the cosmological event horizon, you'll witness the universe aging dramatically-after 30 subjective years, it will be 10 trillion years old with only the faintest stars remaining. After 40 years, even those will have burned out, leaving a dark, cold universe illuminated only by occasional stellar collisions. When discussing how to be on time, Munroe explores the nature of time itself. UTC is measured by precise atomic clocks tracking cesium atom oscillations, but Einstein showed that time slows in strong gravitational fields. Attempting to tamper with these clocks by placing a 1-foot lead ball next to one would only slow it by about 1 part in 10^24-roughly a hundred nanoseconds over 4 billion years. Even more intriguing is the relationship between Earth's rotation and our timekeeping systems. Since 1967, a second has been defined by atomic standards rather than Earth's rotation. Currently, Earth takes about 86,400.001 seconds to complete one rotation-a millisecond too slow. This discrepancy accumulates, requiring occasional leap seconds to maintain synchronization with Earth's rotation.

Chapter 8

The Human Element: Ethics, Psychology, and Social Dynamics

Beyond the physics and engineering challenges, "How To" frequently touches on human elements-ethical considerations, psychological reactions, and social dynamics that complicate seemingly straightforward technical problems. These human factors often prove more challenging than the technical obstacles themselves. When discussing drone capture techniques, Munroe consults Dr. Kate Darling, a robot ethicist at MIT. She notes that while drones don't have feelings, "we tend to treat robots like they're alive," and violence toward increasingly lifelike machines might make people uncomfortable. This highlights how our psychological responses to technology often diverge from rational understanding. Even in laboratory settings, researchers have observed people apologizing to robots they bump into or hesitating to "harm" robot toys, demonstrating our innate tendency to anthropomorphize mechanical objects. This psychological phenomenon extends beyond robots to virtual assistants, cars, and even vacuum cleaners. The chapter on making friends takes a surprisingly earnest turn, noting that most friendships form through structured environments: work, school, religious organizations, neighborhoods, and existing friends. Munroe emphasizes that meaningful connections often develop through repeated, casual interactions rather than forced networking events. There's no magic formula for turning acquaintances into friends because friendship requires genuinely caring about others as people, not as means to an end. As Granny Weatherwax from Terry Pratchett's novels put it, "Sin is when you treat people as things." The book explores how digital technology has both facilitated and complicated modern friendship formation, with social media creating new opportunities for connection while potentially making authentic relationships more challenging. In "How to Win an Election," Munroe explores both ethical and unethical approaches to gaining votes. While name-based electoral trickery rarely succeeds, it keeps getting tried-like the Canadian who legally changed his name to "Above Znoneofthe" hoping voters would mistake it for a "None of the above" option. Similar attempts include candidates changing their names to match popular politicians or deliberately positioning themselves alphabetically on ballots. More substantively, Munroe analyzes polling data to identify the most universally popular positions in American politics-including opposing cell phone use in theaters (95%), supporting laws against texting while driving (97%), and wanting to see declines in hunger (98%) and terrorism (97%). These statistics reveal how certain issues transcend partisan divides, though translating this consensus into policy remains challenging. The chapter on how to tell if you're a "nineties kid" uses generational markers to explore shared cultural experiences. Before the varicella vaccine was introduced in 1995, parents often arranged "chicken pox parties" to ensure their children contracted it early when symptoms were milder. The smallpox vaccine left a distinctive round mark on generations who received it before routine vaccination ended in 1972. Even baby names serve as generational markers-Jeff, Lisa, and Karen suggest the mid-1960s, while Jayden, Isabella, and Sophia point to around 2010. Munroe extends this analysis to technology milestones, noting how different generations relate to innovations like home computers, mobile phones, and social media. He points out that these shared experiences create cultural touchstones that define generational identity beyond mere birth years, influencing everything from communication styles to workplace dynamics.

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Chapter 9

A Final Message to the Future

In the final chapter, "How to Dispose of This Book," Munroe contemplates the ultimate fate of written knowledge and the messages we send to future generations, exploring both the physical and philosophical implications of preserving information across time. He begins with a fascinating scientific breakdown of the book's physical composition. The book contains approximately 8 megajoules of chemical energy, originally harvested from sunlight by plants through photosynthesis. This energy, stored in the cellulose fibers of paper, represents a complex transformation of simple elements: carbon dioxide from the air, water from the soil, and solar energy captured through photosynthesis. If the book were to be incinerated, these components would return to their original forms - the carbon converting to CO2 and water vapor. Munroe calculates that roughly half of the released CO2 would eventually be absorbed by the Earth's oceans, forming septillions of carbonic acid molecules that would disperse throughout the world's waters, effectively spreading tiny pieces of the book across the planet's marine systems. The author then explores various preservation methods, from traditional archival techniques to more extreme solutions. He highlights the remarkable Rosetta spacecraft project as an example of humanity's most ambitious attempts at long-term information preservation. The spacecraft carried a nickel-titanium disc containing 6,000 pages of text in 1,000 different languages to comet 67P/Churyumov-Gerasimenko. This location, far from Earth's destructive forces and in a stable orbit, could potentially preserve this information for millions of years - far longer than any earthbound storage method. Munroe draws parallels between modern preservation efforts and ancient attempts to pass knowledge forward, from Egyptian hieroglyphs to Mesopotamian clay tablets. He notes that while the medium may change - from stone to papyrus to paper to digital storage - the fundamental human desire to communicate across time remains constant. This contemplation leads to his broader philosophical conclusion: all written words, regardless of their intended lifespan, are essentially messages to the future. Whether a book survives for thousands of years in a climate-controlled vault or decomposes back into its constituent elements, it represents humanity's eternal attempt to reach across time - to share knowledge, preserve insights, and sometimes simply to share the joy of intellectual exploration. "How To" thus concludes by positioning itself not just as a collection of absurd scenarios and scientific explanations, but as part of humanity's greater project of knowledge preservation. It demonstrates how rigorous thinking and scientific analysis can illuminate any question, no matter how seemingly ridiculous. The book stands as testament to human curiosity and creativity, showing that even the most outlandish thought experiments can reveal profound truths about our world and our place in it.

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Key Themes in the How To Summary

absurd thought experiments
applied physics
unconventional problem solving
scientific inquiry process
engineering principles

Best Quotes from the How To Summary

Not all ridiculous ideas are created equal.
Each failed solution becomes a stepping stone.
Expertise can inform even the most improbable situations.

Characters in the How To Summary

Randall MunroeAuthor, former NASA roboticist, and xkcd creator
Steve FossettGlider pilot who reached the stratosphere
Einar EnevoldsonGlider pilot who reached the stratosphere
The Wright brothersAviation pioneers discussed for their failures

About the Author

Randall Patrick Munroe, bestselling author of How To: Absurd Scientific Advice for Common Real-World Problems, is the creator of the award-winning webcomic xkcd and a celebrated science communicator.

A physicist and former NASA roboticist, Munroe merges his expertise in physics with deadpan humor to tackle everyday challenges through unconventional scientific lenses. His work, including What If? and Thing Explainer (which explains complex concepts using only the 1,000 most common English words), has been translated into over 35 languages and featured in outlets like The New York Times and NPR’s Science Friday.

Munroe’s xkcd webcomic, launched in 2005, attracts over 500,000 daily readers and earned him a Hugo Award for Best Graphic Story. Asteroid 4942 Munroe, named in his honor, underscores his cultural impact. How To continues his tradition of blending rigorous science with wit, offering solutions to mundane tasks like charging a phone or mailing a package—using principles from rocket science to game theory.

His books have collectively sold millions of copies worldwide, with What If? spending 64 weeks on The New York Times bestseller list.

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I often search YouTube for something to listen to whilst making breakfast, when I'm out walking, commuting, etc, and BeFreed has provided an even more targeted approach, without the adverts and the fluff!

@BeFreed user

The absolute best part about this platform is its versatility. There is literally no subject that is off-topic. It handles whatever you throw at it... It is rare to find an learning tool with zero limitations that actually delivers on its promises.

@jayallen

BeFreed is fantastic. The user-friendly design means I spend less time navigating and more time learning. The mix of audiobooks, podcasts, and learning plans is a genius combo that has completely changed my daily routine.

@BeFreed user

At the start I needed a while to understand how to create podcasts in italian language and boom! It is so great! I can ask to explain every argument and it does so well and so smartly!

@matteo77

BeFreed has become my daily app for audio books tools... What I like the most is the way you put your text and come with an audio that you can listen on the go.

@kotanzu1

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