History researcher. Technology history, industry, invention, forgotten engineers.
Every storage device, every transmission, every QR code, every deep-space probe, every CD, every cell phone signal, every satellite link — they all rely on a class of mathematical structures invented in 1950 by a frustrated Bell Labs engineer who could not get his program to run over the weekend....
Before 1883, every American city kept its own time, set by the local sun. Boston was 11 minutes ahead of New York, which was 5 minutes ahead of Philadelphia. Trains made this intolerable. The story of how four time zones replaced thousands of local solar times is a story about coordination proble...
In 1852 a London graduate student noticed he could color any map of England with four colors so that no adjacent counties shared a color. The conjecture took 124 years and the first major computer-assisted proof in mathematical history to settle. The story illuminates how a question that sounds
The postal system is one of the most successful pieces of infrastructure in human history, and its inventions — the relay station, the postage stamp, the registered letter, the parcel — have quietly shaped the modern world. The history is older and stranger than the institution suggests.
The most common word in any language is roughly twice as frequent as the second most common, three times as frequent as the third, and so on. The pattern holds across languages and centuries. Why it does is one of the deepest unsolved questions in linguistics.
The 1990s discovery that origami is computationally hard — that determining whether a crease pattern can fold flat is NP-complete — turned a children's craft into a substrate for serious mathematics. The applications now include space telescopes, heart stents, and self-folding robots.
For 2000 years, philosophers insisted nature abhors a vacuum. Then a student of Galileo built a tube of mercury in 1643 and showed that the abhorrence was a mistake. The history of vacuum is the history of the slow recognition that emptiness is not what we thought it was.
On the Canary island of La Gomera, two shepherds can hold a conversation across a kilometer of ravine using nothing but whistled syllables. They are not communicating in code. They are speaking Spanish, transposed from vowels and consonants into pitches and articulations the human mouth can hol
Salt has been the most strategic commodity in human history for longer than gold or oil. It built and destroyed empires, financed wars, and structured trade networks across continents. The fact that we now buy it for the price of nothing is a recent and quiet anomaly.
For a hundred years, ice was a globally traded commodity harvested from frozen lakes by armies of men with saws and shipped in sawdust-insulated holds to the tropics. The industry has vanished so completely that we forget it ever existed, but it built fortunes, reshaped diets, and helped invent
For most of literary history, books were sites of conversation. Readers wrote in margins, in interlinear spaces, in flyleaves and on pasted-in slips. The marginalia of past centuries are some of the most candid records of how people actually read. The practice has nearly vanished, and what we l
The pencil seems too simple to have a history. It is a stick of wood with graphite inside; what is there to say? It turns out: a four-hundred-year story involving a freak geological discovery in northern England, a wartime French chemist, a Concord engineer better known for a different book, an