The Things We Make: The Unknown History of Invention from Cathedrals to Soda Cans
Shows how builders from medieval masons to wartime engineers made great things without perfect knowledge, using rules of thumb, trade-offs and teamwork. It also shows how to apply that method to everyday problems.

Table of Content
1. Introduction
1 min 04 sec
Most of us assume great things get built by people who know all the answers before they start. In The Things We Make, chemical engineering professor Bill Hammack, known to many as the Engineer Guy, shows how wrong that is. Some of the people who led the building of Europe’s cathedrals could barely read, and they worked from rules of thumb, intuition and a careful eye for their own mistakes. He calls this the engineering method, and he finds it behind everything from soaring stone vaults to the humble soda can.
His argument is simple. Good making means reaching the best solution available with limited resources, limited time and real uncertainty, using rules of thumb that science can sharpen. Culture shapes the method too, and it is always the work of many hands. Follow the stories of a rope, a wine raft, a racing ship and a melted chocolate bar, and the objects on your desk start to look like decisions someone made. Along the way you pick up a way of solving problems that works in your own job.
2. Build well without knowing everything first
2 min 00 sec
Medieval masons raised cathedrals that prove their mastery, yet their math would look weak beside that of today’s engineers or architects. Their answer to a deadly structural problem fit in a coil of rope, and it reveals how most good work actually gets done.
3. Ask who your best design leaves out
2 min 04 sec
A designer in the 1930s found a way to make telephones and thermostats that nearly everyone could use. His method became an industry standard, and it also hid a problem that still shapes offices, cars and software.
4. Make the most of whatever is on hand
1 min 56 sec
An ancient wine merchant had a lucrative order, a dangerous river and bandits on the only road. The vessel his crew built solved every problem at once and even made money on the trip home.
5. Learn why science alone does not make an inventor
2 min 04 sec
An uninvited ship joined a royal naval parade and left the fastest warships behind. Its builder had the same scientific knowledge as everyone else, so what gave him an edge that still powers much of the world?
6. Give credit to the team behind the name
1 min 32 sec
Everyone remembers who won the race to light the world. Far fewer remember the rival who made the bulb last, or the young inventor at his side, and that forgetting distorts how progress really happens.
7. Expect useful inventions to arrive by surprise
1 min 47 sec
A secret wartime device, smuggled across an ocean to beat a blockade, ended up somewhere its creators never imagined. Its path shows why the goal you start with is rarely the most valuable thing you build.
8. Conclusion
1 min 05 sec
Look around the room you are in. The phone, the thermostat, the can on the table: each holds decisions made by people who never had perfect knowledge or unlimited means. Hammack’s book paints invention as a craft of rules of thumb, tested against cracks, tuned to the materials at hand and passed through many hands, with science as a sharp tool along the way. Culture shapes those rules as well, sometimes in ways that leave people out.
That picture is useful far beyond engineering. When a problem arrives without all the facts, start from the shortcuts you trust, like the mason’s rope, and watch for the places where they fail. When someone calls a design or a rule the best, ask whose measurements it rests on, as Georgena Terry did with her bicycles. When the credit goes to one famous name, remember Lewis Latimer and the bulb that lasted 40 hours.
Some of the masters who raised Europe’s cathedrals could barely read, and their walls are still standing. They had a rope, a rule and the patience to learn from every crack.
About this book
What is this book about?
We tend to picture invention as a lone genius applying flawless science. Bill Hammack, a chemical engineering professor, tells a different story. Some of the masters who led history's great building projects could barely read or write. They worked anyway, with rules of thumb, intuition and close attention to their own mistakes. Hammack calls this the engineering method, and he finds it behind everything from stone vaults to the shape of a soda can. He follows the method through a series of stories: a rope that set the thickness of cathedral walls, an ancient wine raft whose every part was sold or reused, a racing ship that outran the British Navy, a light bulb rivalry and a wartime device that ended up in kitchens. Along the way he shows how engineers choose what counts as best, why those choices carry cultural blind spots, how science helps without replacing creativity, and why no invention belongs to one person. Readers learn to see the objects around them as decisions made under pressure, and they get a practical way of solving problems when the facts are incomplete and the resources are short.
Book Information
Who it's for
Problem solvers under pressure
Professionals who must solve problems with incomplete information, tight budgets and little time.
Designers, product teams, managers
Designers, product people and managers who want to spot whose needs their best solution ignores.
Inquisitive minds
Curious readers who want the hidden stories behind cathedrals, light bulbs, turbines and microwaves.
About the Author
Bill Hammack
Bill Hammack, born in 1961, is a professor of chemical engineering at the University of Illinois Urbana-Champaign. Many people know him as the Engineer Guy, a persona that began with radio commentaries for Illinois Public Media from 1999 to 2005 and grew from 2010 into a regular YouTube series explaining the engineering behind everyday objects. He also wrote Fatal Flight and co-authored Eight Amazing Engineering Stories. Journalism and engineering groups have both recognized his work: he received the Science in Society Award from the National Association of Science Writers and the Edwin F. Church Medal.
Ratings & Reviews
Ratings at a glance
What people think
Listeners find the book highly insightful, as one review mentions how it breaks down the underlying logic and methodology of engineering. It also serves as an excellent pick for engineering fans, with one listener characterizing it as a wonderful treatise on the humanity of engineering. Additionally, the text contains fascinating historical stories and is highly readable.
Top reviews
Finally got around to reading Hammack's latest, and it is a wonderful treatise on the humanity of engineering. Most people think of engineering as just cold, hard math, but this book proves it is a creative art form. The stories about the kelek rafts and the master masons of the 13th century are absolutely gripping. I loved the explanation of 'rules of thumb' and how they allow us to build even when the science isn't fully understood yet. Hammack’s style is accessible and warm, making complex logic feel like a conversation over coffee. It is easily one of the most insightful books I have read this year regarding how we shape our world.
Show moreAs a long-time subscriber to the 'Engineer Guy' YouTube channel, I was eager to see Hammack’s philosophy in print. He does not disappoint! This book captures the logic and approach of engineering perfectly, illustrating how humans use limited resources to solve pressing challenges. The illustrations are a fantastic touch that help visualize the concepts like the pointed arches in Saint-Chappelle. I particularly enjoyed the discussion on trade-offs, like why soda cans are shaped the way they are to balance strength and storage. It is a fascinating look at technology that celebrates the trial and error required for real-world breakthroughs. Highly recommended for any curious mind!
Show moreTo be fair, I expected a dry textbook, but what I got was a wonderful treatise on human ingenuity. Bill Hammack explains the 'Engineering Method' with such clarity that even a non-technical reader can grasp the brilliance of a 50-foot raft on the Euphrates. The way he describes the trade-offs between cost, time, and safety really humanizes the profession. It isn't just about math; it's about making the best possible decision with limited resources. The stories about the soda can and the steam turbine are highlights that I’ve already shared with several friends. If you want to understand the logic behind the ordinary objects in your house, you should definitely pick this up.
Show moreWow, Hammack really nails the distinction between science and engineering in a way that feels incredibly fresh and necessary. I loved the story of Georgena Terry designing bicycles specifically for women’s proportions—it’s a perfect example of the engineering method in action. The book is full of these kinds of inclusive, diverse examples that show how engineering touches every life differently. It’s an easy read, but it leaves you with a much deeper appreciation for the 'invisible' steps behind every invention. From the light bulb to the microwave, the focus on trial and error is truly inspiring. This is a must-read for anyone who loves knowing how the world actually functions.
Show moreEver wonder how ancient civilizations built massive structures without modern calculators? It turns out they relied on something Hammack calls the 'engineering method,' a pragmatic approach based on trial, error, and reliable rules of thumb. The chapter on medieval cathedrals and the simple rope trick used to determine wall thickness was a total 'aha' moment for me. Hammack rephrases complex logic into something easy to read and deeply insightful. While the second half of the book meanders a bit into long-winded histories of specific individuals, the core message about how we solve problems under uncertainty is powerful. It’s a great read for anyone curious about the humanity hidden inside our technology.
Show moreWhat a fascinating look at the 'rules of thumb' that actually govern our physical world. The story of the microwave oven and how it evolved from wartime magnetrons was a highlight for me. Hammack explains the engineering method as a way of dealing with incomplete information, which is a lesson that applies far beyond the workshop. I also appreciated the discussion on how cultural biases can affect design, like crash test dummies or game controllers. The writing is incredibly easy to read and manages to be educational without ever feeling like a lecture. There are some minor pacing issues in the middle, but the historical anecdotes more than make up for it.
Show moreThe information presented here is undeniably interesting, though the pacing felt a bit uneven throughout the second half of the text. I appreciated the deep dive into the steam turbine and the soda can, but some chapters felt much more polished than others. As an engineer, I enjoyed the distinction between our field and pure science, particularly the idea that we often act before the theory is finalized. However, the tone shifts from academic to casual quite abruptly. Truth is, it’s a decent introductory book for hobbyists, but seasoned professionals might find it a bit light on technical substance. It’s an okay read, just not the definitive work I was expecting.
Show moreI'm an engineer by trade, so I usually love books about our history, and this one offered a solid defense of our discipline. I especially liked the point that engineering often precedes the scientific understanding of why something works. However, the book felt somewhat like a series of disjointed essays that didn't always mesh together into a single argument. The section on ceramic dish techniques felt far too long compared to other, more pressing innovations mentioned earlier. It’s a decent read for the commute, but I wanted a more unified narrative structure. To be fair, Hammack’s voice is clear and his passion for the 'rules of thumb' is contagious, but it didn't quite satisfy my craving for a deep history.
Show moreThis felt like a collection of leftover chapters rather than a cohesive narrative about the history of making. While the first half makes an excellent point about engineering not being 'applied science,' the second half drags significantly. Do we really need a ten-page deep dive into one man's specific techniques for ceramic dishes? It felt like a 'fix-up' novel where disparate essays were stitched together by an editor. Furthermore, the occasional political interjections about the status of women and non-European races felt jarringly out of place. They didn't follow the author’s main technical points and served only to interrupt the flow of what should have been a focused history. It was a bit blah overall.
Show moreI was really enjoying the technical history until the author started shoehorning in modern social ideologies. When a book about the mechanical evolution of the world starts using terms like 'cisgender,' I lose interest immediately. Engineering should be about the physics and the logic of the build, not about buying into silly academic jargon. There were also several interruptions where an editor clearly stepped in to lecture the reader on the status of women in the past. These sections felt completely disconnected from the actual engineering points being made. It’s a shame because the historical anecdotes were actually quite good, but the ideological slant ruined the experience for me.
Show moreQuestions about this book
What is the main idea of The Things We Make by Bill Hammack?
Hammack argues that great things are made through the engineering method: using rules of thumb to reach the best solution possible with limited resources, limited time and real uncertainty. Medieval masons, ancient wine traders and modern engineers all worked this way. Science can sharpen those rules, but creativity, trade-offs, cultural context and teamwork decide what actually gets built.
What is the engineering method according to Hammack?
It is the practice of applying tested rules of thumb creatively when knowledge is incomplete. Thirteenth-century masons, for example, used a rope folded into thirds to work out how thick a cathedral wall should be, then watched for cracks and adjusted with harder stone. Makers draw on training, experience and intuition, expect mistakes and learn from them.
Why does Hammack say there is no lone inventor?
Every invention builds on what earlier generations learned and on the teams around the famous name. Thomas Edison’s first bulbs burned out within minutes, while his rival Hiram Maxim, working with the young African-American inventor Lewis Latimer, made a bulb that lasted up to 40 hours. Neither man would have advanced without inherited knowledge and collaborators.
How can I apply the ideas in The Things We Make?
Start difficult problems with the shortcuts you already trust, then watch for where they fail and adjust. List the resources you actually have and design around them, as the ancient kelek raft crew did. When something is called the best option, ask whose measurements it rests on, the way Georgena Terry redesigned bicycles around women’s bodies.
What role does science play in engineering in the book?
Science is a tool, not the whole craft. Charles Parsons studied scientists such as William John Macquorn Rankine to learn which turbine ideas were possible, which saved him from guesswork, yet he still needed a decade of trial and error. Hammack compares science to a hammer: it helps a carpenter, but owning one does not make you a carpenter.
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