Blurb/Description: Explores the hidden histories of modern innovations like glass, artificial cold, clean water, and precise time. It reveals how these technologies emerged from unexpected connections and “slow hunches,” leading to massive, unforeseen social and political change.
Summary: This book explores the unexpected, linked beginnings of crucial technologies that shape the contemporary world. The author contends that true innovation seldom arises from a singular flash of inspiration, but is instead a gradual, interconnected process where concepts accumulate within the adjacent possible. For instance, the quest for artificial cold started with Frederic Tudor’s bold venture to ship natural ice, which made the commercial demand for cold obvious and supported the massive growth of the Chicago stockyards. This progress then accelerated the invention of mechanical refrigeration once the necessary scientific groundwork, like thermodynamics, was established. The book uses this perspective for other innovations, such as the development of highly clear glass for fiber optics, water chlorination for public health gains, and the factory and navigation needs for precise timing, which led to quartz clocks, computation, and GPS. A central thesis is that these fundamental inventions lead to vast, unforeseen secondary consequences, like air conditioning sparking the demographic shift that built the Sun Belt.
Highlights:The book is masterful at drawing connections between disparate areas, demonstrating how a solution in one field (e.g., controlling humidity for printing) can unexpectedly solve a problem in another (e.g., creating air conditioning). It expertly employs the concept of multiple invention to illustrate that breakthroughs often become logically determined once the foundational science is ready. The inclusion of striking, detailed stories, such as descriptions of harvesting spermaceti from whales, makes the complex history of technology captivating and easy to recall.
Lowlights: Although the examples are fascinating, the book proved to be a little less interesting or deep than I was anticipating.
The concept of the adjacent possible, which dictates that new inventions only become conceivable when the fundamental scientific and technological components are already established, as seen with refrigeration waiting for an understanding of thermodynamics.
Innovations frequently generate massive, unpredictable second-order effects, such as how the invention of air conditioning spurred the significant demographic migration to the Sun Belt region.
The significant influence of conceptual metaphors, which can limit imagination. For example, the focus on “writing sound” prevented the inventor of the phonautograph from realizing the potential for sound playback.
The “multiple invention” phenomenon, where major advances like the laser or refrigeration are often discovered by several unconnected researchers simultaneously, suggesting these breakthroughs are often inevitable.
The essential role of effective feedback loops created by precise measurement. Tools developed by figures like Robert Koch allowed for the rapid, data-driven refinement of technologies like clean water chlorination.
The adoption of technology often follows a nonlinear path with unequal distribution. The bar-code scanner, by resolving an inventory bottleneck, offered disproportionately large benefits to large retailers, reshaping the competitive landscape.
You should buy a copy of How We Got to Now if: Ideal for anyone curious about the hidden origins of everyday technologies and how innovation actually happens through interconnected networks of ideas.
Reading Tips: Focus on the connections between the different stories (glass, cold, time, etc.), as the core theme is how these ideas build on each other. Pay attention to the “multiple invention” and “adjacent possible” concepts, as they are the book’s central framework.
IMPORTANT: the below commentary DOES NOT SUBSTITUTE for READING THE BOOK.
Glass: From Ornament to Information Backbone
Glass began as a rare natural ornament, such as the sliver of Libyan desert glass found in King Tut’s scarab brooch. The Romans were the first to industrialize it, figuring out how to make it sturdier and less cloudy for applications like the first windows and new wine vessels. However, the material’s most transformative application came when it was linked to information. This required a technological leap, achieved by Corning Glassworks in the 1970s, to create “super-clear” glass. This new glass was so transparent that a block half a mile long would be as clear as a normal windowpane.
This innovation, when paired with the invention of the laser, enabled the creation of fiber-optic cables. These thin threads of glass became the backbone of the global internet, capable of transmitting data as pulses of light. Glass fibers proved vastly more efficient than copper cables, offering more bandwidth, less signal loss over long distances, and less susceptibility to interference. Today, the entire modern digital experience is built on glass. We take photos through glass lenses, view them on glass screens, on devices built with fiberglass circuit boards, and transmit them around the world through glass cables.
Stories & Anecdotes
A scarab-shaped ornament made of naturally formed silicon dioxide (glass) traveled from the Libyan Desert and was eventually unearthed in the tomb of the Egyptian ruler Tutankhamun in 1922.
Research & Statistics
In 1970, researchers at Corning developed a type of glass so clear that a block of it the length of a football field (later refined to a half-mile) was as transparent as a standard windowpane.
The backbone of the global internet consists of fiber-optic cables, many traversing oceans, which contain numerous thin glass fibers, each capable of carrying vast amounts of data encoded in laser beams.
Mechanisms
The key transition was moving from glass’s aesthetic property (transparency for windows) to its functional property for information encoding.
Paired with lasers, hyper-clear glass fibers allow binary code (ones and zeroes) to be sent as fluctuating light signals, forming the basis of fiber-optic communication.
Frederic Tudor and the Natural Ice Trade
The concept of “cold” as a commercial technology was essentially invented by Frederic Tudor in the early 19th century. As a young man, he suffered through the humidity of the Caribbean and conceived the seemingly preposterous idea of shipping natural ice from New England lakes to the tropics. He discovered that if the ice was cut into large blocks and properly insulated, it could survive the journey and last for months. This trade created a massive new market, demonstrating that there was immense commercial demand for cold. This demand had significant second-order effects, most notably enabling the rise of the Chicago stockyards. The ability to ship beef and other perishable goods in refrigerated railcars (cooled by natural ice) transformed the American food network from a local to a national and global system. While the industrial revolution was powered by heat (steam), Tudor’s success signaled to the world that a fortune could be made from cold, spurring the search for artificial refrigeration.
Stories & Anecdotes
At age 17, Tudor’s father sent him to the Caribbean with his older brother, John, who was an invalid. The trip was intended to improve John’s health, but the heat and humidity had the opposite effect, and John died six months later.
This personal and miserable experience with inescapable heat is what planted the seed for Tudor’s idea to transport ice from New England to the West Indies.
Research & Statistics
The Chicago stockyards, which emerged in the late 19th century, slaughtered an average of 14 million animals per year.
This industrial food complex, with its assembly line of dissection, was entirely dependent on the ice-cooled transport network (refrigerator cars) that extended from the slaughterhouses.
Mechanisms
Chicago’s growth was built just as much on the peculiar chemical properties of water (its ability to freeze and slowly release its cold) as it was on the railroad or the Erie Canal.
Artificial Cold and “Multiple Invention”
The invention of artificial refrigeration is a classic example of the “adjacent possible” and “multiple invention.” A century into the industrial revolution, artificial cold was still a fantasy because the necessary scientific building blocks were missing (an example of bottlenecks).
First, scientists in the 1600s, like Robert Boyle, had to discover that air was “something” and explore the properties of a vacuum. This eventually led to the science of thermodynamics, which explains the relationship between heat, pressure, and volume in gases. Once these concepts were understood, the idea of artificial cold became “imaginable.” John Gorrie, a doctor, built a working machine using a pump to compress air (which heated it), then cooled the compressed air with water, and finally allowed it to expand (which extracted heat from the environment, creating cold). Gorrie’s machine worked, but he failed as a businessman, in part because the dominant natural ice industry, led by Tudor, launched a smear campaign against his “infected” ice.
Crucially, the idea didn’t die with Gorrie. Once the scientific building blocks were in place, the invention became “inevitable,” and patents for similar refrigeration devices began to appear independently all over the world. This pattern of “multiple invention” where several disconnected investigators stumble onto the same discovery at the same time, is the rule, not the exception, for major breakthroughs.
Stories & Anecdotes
In 1659, Robert Boyle placed a bird in a jar and used a vacuum pump to suck out the air. The bird died, but it also froze, providing an early, curious clue about the relationship between air, pressure, and temperature.
Ferdinand Carre, a French engineer, independently designed a refrigeration machine that followed the same basic principles as Gorrie’s. It was his design that would ultimately triumph.
Mechanisms
Inventions are networks and remixes of existing ideas. The smartest mind in 1650 couldn’t invent a refrigerator because the scientific “part” of thermodynamics wasn’t in the “adjacent possible” yet.
Counterpoints, Limits & Edge Cases
Dominant industries often disparage disruptive new technologies. Frederic Tudor claimed Gorrie’s artificial ice was infected with bacteria, just as early graphical-interface computers were dismissed as “toys” by rivals.
Accelerants and Impacts of Cold Technology
The adoption of artificial refrigeration was massively accelerated by an external shock: the American Civil War. The Union naval blockade stopped the flow of natural ice from New England to the southern states, which had become culturally and economically dependent on it. This created a desperate need, leading to the smuggling of Ferdinand Carre’s ammonia-based ice-making machines from France. By 1870, the South was making more artificial ice than anywhere else.
This foundational technology spurred further innovations. Clarence Birdseye, after spending time with Inuit fishermen in Labrador, developed the “slow hunch” that flash-freezing was superior to slow-freezing. He observed that fish frozen instantly in -40 degree air tasted fresh for months, whereas slowly frozen food became mushy. His insight was that slow freezing creates large, cell-damaging ice crystals, while flash freezing creates small, harmless ones. This led to the frozen food industry and General Foods.
A final, massive innovation was Willis Carrier’s air conditioner, an accidental discovery from a 1902 project to dehumidify a printing plant. Once miniaturized into window units after WWII, AC triggered one of the largest demographic shifts in American history, enabling the rise of the “Sun Belt” and reversing the Great Migration. This, in turn, had vast political consequences and enabled the growth of massive tropical megacities around the world.
Stories & Anecdotes
Smugglers during the Civil War brought Carre’s ice-making machines, along with weapons, to Confederate states, allowing commercial ice plants to open in Georgia, Louisiana, and Texas.
Birdseye’s “slow hunch” began with tasting fresh, flash-frozen trout in Labrador and contrasted with his later job inspecting appalling, rotting cod in New York’s commercial fisheries.
Willis Carrier’s invention was for a Brooklyn printing company to stop ink from smearing in summer humidity. He noticed everyone wanted to have lunch next to the machine because it also chilled the air.
Research & Statistics
The post-AC migration to the Sun Belt was explosive. In just 10 years (1940s-1950s), Tucson’s population grew from 45,000 to 210,000, and Houston’s from 600,000 to 940,000.
This migration reversed the post-Civil War flow from South to North and changed the political map as conservative Northern retirees moved south.
The Unseen Revolution of Clean Water
One of the most significant and overlooked innovations in public health is clean drinking water. In 19th-century cities, the real killers were not criminals but waterborne diseases like typhoid and cholera. Chicago’s ambitious sewer system, for example, had a fatal flaw: it drained directly into the Chicago River, which emptied into Lake Michigan, the city’s primary source of drinking water.
The solution came from Dr. John Leal, who was personally motivated after his father died a slow, painful death from disease contracted during the Civil War. Leal began experimenting with chlorine (calcium hypochlorite) as a disinfectant, but the idea was repellent to the public, who associated the smell with disease. A critical enabler for his work was the new scientific tool of measurement, developed by figures like Robert Koch. The ability to measure bacterial density (e.g., colonies per milliliter) allowed for rapid, empirical feedback loops in experimentation, rather than just waiting to see if fewer people died.
In 1908, Leal took a massive gamble. Hired by a water company being sued for not providing “pure and wholesome” water, he secretly built a chlorine-feed facility and disinfected the entire Boonton Reservoir supply for Jersey City, without public notice or a pilot study. The gamble worked, the water was declared pure, and Leal made no attempt to patent his technique, allowing it to be freely adopted worldwide.
Stories & Anecdotes
In 19th-century London, the “real killers” were not figures like Jack the Ripper, but the diseases bred by contaminated water supplies.
In Chicago, the water supply was so appalling that a tub filled from the tap might contain dead fish poisoned by the city’s own sewage.
During his cross-examination, a prosecuting attorney accused Leal of seeking a “fortune.” Leal interrupted, stating he didn’t know where the fortune was and that the idea was free for all to use.
Research & Statistics
During the Civil War, 19 men in Leal’s father’s regiment died in combat, while 178 died of disease, highlighting the threat of contaminated water.
A study by Harvard professors David Cutler and Grant Miller on the period between 1900 and 1930 found that clean water (chlorination and filtration) led to a 43% reduction in total mortality and an even greater reduction in infant mortality.
Mechanisms
New ways of measuring create new ways of making. Koch’s tools for measuring bacterial colonies allowed experimenters to test water purity empirically and rapidly.
A second-order effect of clean water was the rise of ten thousand public swimming pools, which became key social spaces for challenging decency norms, particularly for women’s swimwear.
The Invention of “Time Discipline”
For most of human history, precise timekeeping was unnecessary. Clocks in the 16th century were so inaccurate they might lose or gain 20 minutes a day, which was acceptable for daily life. The first major need for split-second accuracy came not from daily life, but from navigation. This was the great age of global exploration, and sailors lacked a reliable way to determine longitude. Latitude could be found from the sky, but longitude required comparing the time at sea (from the sun) with the exact time at the home port. This “longitude problem” drove innovation, with large prizes offered for a solution.
A second, equally powerful driver was the Industrial Revolution. Synchronizing hundreds of factory workers with the tempo of machines required a new “time discipline.” The pottery manufacturer Josiah Wedgwood was the first to implement “clocking in” to work. This innovation led to the concept of the “hourly wage,” fundamentally reframing time as a currency to be “spent” rather than “passed.” This was a profound cultural shock for the first generation of industrial laborers.
Stories & Anecdotes
The urgency of the longitude problem was so great that Spain’s Philip III offered a life pension and England’s famous Longitude Prize promised over a million dollars in today’s currency for a solution.
Before “time discipline,” work life was desultory. A modern worker showing up for a shift at an “unwieldy” time, as was common, would be unthinkable today.
Mechanisms
Technology progression: Pendulum clocks (relying on physics and motion) were replaced by quartz clocks (relying on electromechanics).
Pierre and Jacques Curie discovered “piezoelectricity” in the 1880s—the property of quartz crystals to vibrate at an remarkably stable frequency when pressure or an alternating current is applied.
Time, Computation, and Space
The quest for timekeeping precision culminated in the quartz clock, built by W. A. Marrison at Bell Labs in 1928. Based on the stable piezoelectric vibrations of quartz crystals, it was orders of magnitude more accurate than pendulum clocks, losing only a thousandth of a second per day. While initially used for scientific purposes, this new level of microsecond accuracy enabled the modern computation revolution.
A microprocessor is fundamentally a master of “time discipline.” It executes billions of calculations per second, with all operations perfectly coordinated by a master clock, which is almost always made of quartz. Without the microsecond accuracy of quartz, modern computers would be useless.
This convergence of time and technology finds its ultimate expression in GPS. When your phone determines its location, it is pulling down time stamps from at least three different satellites. Because the signals travel at a known speed, the minutely different times they are received (a closer satellite’s signal arrives earlier) allow the phone to triangulate its precise position in space. This fulfills an idea Einstein would have appreciated: measuring time has become equivalent to measuring space.
Mechanisms
A modern computer coordinates billions of operations per second, shuffling bits of information. This requires the same kind of time discipline as a factory, but on a microsecond scale.
Tinkering with a computer to make it run faster than its designed speed is called “overclocking,” a direct reference to its quartz clock.
GPS works just like 18th-century navigators: by comparing clocks. The phone compares the time stamps from three (or more) satellites of known position to find its own unknown position.
Artificial Light and Measuring Progress
The earliest form of high-quality artificial light was the spermaceti candle, made from a white, oily substance found in the heads of sperm whales. These candles burned brighter and cleaner than tallow, becoming a luxury item (George Washington spent $15,000 in today’s currency on them). This demand drove the dangerous and repulsive Nantucket whaling industry, which was responsible for thousands of deaths at sea. The sperm whale was likely saved from extinction only by the discovery of petroleum-based solutions like kerosene. This progression from tallow to kerosene to the electric lightbulb provides a powerful way to measure technological progress.
Yale historian William D. Nordhaus argued that standard inflation adjustments fail to capture the true impact of innovation, because they can’t account for goods that didn’t exist (like an iPod in 1850). He proposed using the “cost of light” as a constant anchor. He measured the “true cost” of light in terms of how many “lumen-hours” an average hour of work could buy. The results are staggering and show the impact of technology far better than simple wage comparisons.
Stories & Anecdotes
The substance was named “spermaceti” due to its resemblance to seminal fluid, though scientists now believe it’s used for buoyancy or echolocation.
To extract the spermaceti, men had to crawl inside the giant, rotting carcass of the whale’s head and scrape the substance out.
Research & Statistics
Nordhaus’s study: In 1800, one hour of work at the average wage could buy about 10 minutes of artificial light (from a tallow candle).
With kerosene in 1880, that same hour of work bought 3 hours of light.
By the 1990s (with electric bulbs), one hour of work bought over 300 days of artificial light.
Metaphors as Conceptual Blinders
Our conceptual metaphors are powerful tools for innovation, but they can also act as powerful blinders. Edouard-Leon Scott de Martinville invented a device to record sound, the phonautograph, a generation before Edison’s phonograph. His device worked: it etched sound waves onto lampblack. However, he never conceived of playback. The idea never even occurred to him. This is because his guiding metaphor was “stenography.” He thought his machine was “writing sound waves” and that, in the future, humans would learn to “read” the visual squiggles, just as a stenographer reads shorthand. This metaphor, borrowed from printing and anatomical studies, allowed him to make the initial leap. But it also completely blocked him from seeing the adjacent, and arguably more obvious, possibility of sound reproduction. He wasn’t trying to invent a record player; he was trying to invent the ultimate transcription service.
Mechanisms
Scott’s cross-disciplinary thinking (borrowing from stenography and anatomy) was a strength that led to the invention.
The same “writing sound” schema that enabled his breakthrough also defined the boundaries of his imagination, preventing him from discovering playback.
The Laser’s Uneven Impact
The laser, like refrigeration, was a “multiple invention” developed simultaneously by several parties (Bell Labs, Hughes Aircraft, Gordon Gould) in the 1960s. It is an intensely concentrated, orderly beam of light, described as being to ordinary light what a broadcast signal is to static. Unlike the lightbulb, it was a technology without a clear consumer product. Science fiction authors had imagined it for decades, but almost exclusively as a weapon (a “death ray”).
Its true impact turned out to be in information and logistics. One of its first major applications was the bar-code scanner. Research by economist Emek Basker revealed that the productivity gains from this technology were slow to appear and, more importantly, were not evenly distributed. Big stores that could afford the new systems reaped massive benefits, while small stores could not. The scanner’s true impact was nonlinear and structural: it dramatically reduced the cost and friction of managing a large inventory. This automation removed a key bottleneck, enabling the “big-box” retail revolution. Stores like Target, Best Buy, and massive supermarkets became economically viable, while the “mom-and-pop” indie stores were demolished.
Stories & Anecdotes
Physicist Gordon Gould, who fought a 30-year legal battle over the laser patent (which he eventually won), famously notarized his original design in a Manhattan candy store.
If there was a “death ray” in the laser’s history, it was the metaphoric one directed at the small independent stores driven out of business by the scanner-enabled big-box revolution.
Research & Statistics
Basker’s research showed that the productivity gains from bar-code scanners were not evenly distributed, with large stores benefiting far more than small ones.
Before scanners, the costs of tracking a vast inventory (e.g., 1000 items vs 100) often offset the benefits. Scanners removed this cost, allowing for massive scaling.
Inversion in the Clean Room
The manufacturing of modern microchips requires some of the cleanest environments on Earth. In these “clean rooms,” such as those at Texas Instruments, a single speck of household dust is comparable to Mount Everest landing in Manhattan. This environment creates a profound inversion of the typical human-environment relationship. Normally, a person wears a protective suit to guard themselves against a hostile environment (e.g., extreme cold, pathogens, the vacuum of space). In the clean room, the suit is designed to protect the environment from the human. From the microchip’s perspective, the human is the pathogen. We are a “dust cloud of filth,” shedding hair follicles, epidermal layers, and mucus, all of which threaten the delicate resources being created.
Anecdotes
To even enter the space, workers must don a full-body “clean suit” made of sterile materials that don’t shed.
Washing up before entering is so strict that even soap is disallowed, as most soaps contain fragrances that could give off potential contaminants.
Raising Chicago
In the mid-19th century, Chicago embarked on one of the most ambitious and surreal engineering projects in history: installing a comprehensive sewer system. To do this, the city had to be physically lifted. Engineers used thousands of jackscrews to slowly raise entire city blocks—buildings, hotels, and all. This process was done with such care that life inside the buildings continued largely undisturbed. This Herculean effort created the first comprehensive sewer system in any American city, a model that others would follow.
However, this brilliant plan had a fatal flaw: the sewers were designed to drain into the Chicago River, which emptied directly into Lake Michigan. Since Lake Michigan was the city’s primary source of drinking water, the sewer system simultaneously solved the street-level sanitation problem and created a massive contaminated water crisis.
Stories & Anecdotes
A British visitor described the “surreal experience” of observing a 750-ton hotel being lifted while people inside continued “coming and going, eating and sleeping” without interruption.
In 1860, engineers raised half a block on Madison Street—an entire acre of buildings weighing an estimated 35,000 tons—using over six thousand jackscrews.
One visitor recalled meeting nine houses being moved on rollers in a single day.
Mechanisms
The goal was to install sewer and water lines before breaking ground on new buildings, a revolutionary idea at the time. For existing structures, the only solution was to lift them.
Counterpoints, Limits & Edge Cases
The plan’s unintended consequence was poisoning the city’s water supply, creating a public health crisis that would require a second revolution (chlorination) to solve.
