The treadmill was invented as a machine for prison labor

Pilates was invented by an acrobatic WWI prisoner of war

As the Great War raged on, and as months gave way to years, the imprisoned Joseph Pilates explored a question that he had pondered since childhood: Could he reimagine the capabilities of the human body through an anatomically based method of training, taking inspiration from scientific treatises, the carefree movement of children, and the dexterous ease of cats? Read this article to learn about the birth and legacy of Pilates.

Among the smallest mass-produced mechanical calculators in history, the Curta was designed by Austrian engineer Curt Herzstark while imprisoned in a Nazi concentration camp during World War II.

Peloton paid a $19M fine for its handling of treadmill injuries

In 2021, a six-year-old died after getting caught underneath a Peloton treadmill. A federal investigation into the company revealed that Peloton knew about injuries on the treadmill as early as 2018 and failed to report the incidents to the US Consumer Product Safety Commission.

Computer pioneer Alan Turing was also an elite runner

Alan Turing is credited with helping to found modern computer science, in addition to cracking the Nazi code known as Enigma. Beyond these world-historical achievements, the British mathematician also nearly represented his country in the Olympics in the marathon, running just 11 minutes slower than the eventual gold recipient at the 1948 games. Read more on this lesser-known aspect of the man here.

The 13th Amendment's criminal exception enabled new forms of forced labor

Southern states exploited the amendment's clause allowing slavery "as punishment for crime" to arrest thousands of Black Americans on minor charges, leasing them to private employers through convict labor systems that persisted for decades.

The first commercially successful calculating machine—the arithmometer—was patented in 1820 but not mass-produced for over three decades, likely because its inventor was focused on his insurance business.

Alternating current was used to commit the first execution by electric chair

Dubbed the "executioner's current," the device was designed in Thomas Edison's lab by Harold Brown—an opponent of George Westinghouse and Nikola Tesla. The effort aimed at discrediting AC technology and gain favor for Thomas Edison's direct current as part of "The Current War."

Bill Bowerman got the idea for the breakthrough waffle-knit running shoe from a waffle iron

Nike cofounder Bill Bowerman was trying to find new ways to create traction for his runners on artificial turf. He looked at the waffle iron and realized that the pattern would work for the shoes’ soles.

People in certain states can now work remotely from prison.

A bankrupt flour merchant in debtor's prison helped inspire the Erie Canal.

The iron lung—a simple mechanical ventilator—was first used to treat polio

These breathing devices, developed in the late 1920s at Harvard, were used to treat polio patients with breathing difficulties. Watch this video describing how these negative pressure devices work.

What's the role of forced prison labor in a land where slavery is illegal?

Companies across the South profited off the forced labor of people in prison after the Civil War. This hourlong investigative podcast episode explores the role forced (and often unpaid) prison labor has played in the US since slavery was abolished.

Modern tennis was formalized in 1874

In the late 1800s England, a growing middle class could afford homes with lawns. With more lawns in England, Major Walter C. Wingfield saw an opportunity to bring lawn tennis to the masses. Modern tennis was formalized in 1874, when Queen Victoria granted a patent for Major Walter C. Wingfield's lawn tennis box set. The game was an instant hit, and by 1877, the new All England Club in Wimbledon began hosting a tournament.

The first tattoo gun was based on an electric pen invented by Thomas Edison.

As a child, Twain worked as a 'printer's devil'

Twain’s father died in 1847, forcing the 12-year-old Twain to leave school to earn money for the family. He took up work in a print shop as a “printer’s devil,” or an apprentice. He became fascinated with the technology, an experience he’d pursue further when he became a journalist several years later.

Twain invented a clasp that's still used for bras

In 1871, Twain patented an “improvement in adjustable and detachable straps for garments.” Although he intended it for “vests, pantaloons, or other garments requiring straps,” it’s mostly used today in brassieres.

Bill Bowerman brought running for fitness to America

Nike cofounder Bill Bowerman once cowrote a book with a doctor, W.E. Harris, called “Jogging.” Published in 1967 by New York, Grosset & Dunlap, it introduced America to the idea of running for health, instead of just sport—and kicked off the fitness frenzy of the 1970s that fueled Nike’s early success. (Some readers may experience a paywall).

One Connecticut prison is using pickleball for rehabilitation

The Pickleball for Incarcerated Communities League started in 2023 at the MacDougall-Walker Correctional Institution in Hartford, Connecticut, but has already expanded to other facilities across the state. Inmates say it's been transformative. The program has plans to expand to other states.

The history of many kitchen appliances involves unexpected discoveries and applications, including wartime radar turned hamster defroster and replacing an 'ice king' with heat-stealing boxes.

Watch someone drive a Model T Ford, which feels like driving 'a tractor with the soul of a sewing machine'—and learn how to operate one.

Turing machines consist of an infinite tape, a read-write mechanism and instructions

Based on the information the mechanism reads on the tape, the machine follows the applicable instruction (e.g., if you read a 1, write a 0) and may proceed to the next cell of data. Given enough time and memory, Alan Turing proposed such a machine could perform any computation.

One of the first mechanical calculators—the Pascaline—was built in the 1640s by French mathematician Blaise Pascal to help his father, who worked as a tax collector.

Rune Elmqvist forwent practicing medicine to invent the first inkjet printer

The Mingograph recorded real-time physiological signals from a patient's electrocardiogram, helping doctors diagnose heart and brain conditions. Eight years later, in 1958, Elmqvist worked with cardiac surgeon Åke Senning to develop the first fully implantable pacemaker.

LaMarcus Thompson wanted roller coasters to save people from Satan’s temptations

The inventor and businessman who is known as “the Father of the American roller coaster” was also a religious Sunday school teacher who wished to distract the public from indulging in popular sinful amusements of the time like saloons and brothels.

Henry Ford pioneered the first moving assembly line, building on earlier iterations of the manufacturing method

Although cars existed before the Model T, manufacturing them required a group of highly specialized mechanics. The Model T was so affordable in large part because of the moving assembly line, which cut down the total manufacturing time of the car and replaced specialized workers with general laborers who performed repetitive tasks.

The world's first geothermal power plant was built in 1913 in Devil's Valley

In Tuscany, Italy, Prince Piero Ginori-Conti of Trevignano established the plant nine years after creating a generator that powered five light bulbs using steam vents in the area. Within three years, a second plant was built with two generators, each with 10 times the energy output of the first.

Why were tanks invented?

Tanks first appeared in warfare in World War I. As old methods of conducting battles proved ineffective, the idea of an armored vehicle that could traverse almost any terrain and carry a cannon came to fruition. World War I provided the impetus and finances to develop the modern tank. Learn more in this short but detailed article.

Boston opened the first subway tunnel in the US in 1897

By the end of the 19th century, nearly 400,000 people were packed into less than a square mile of downtown Boston, with 8,000 horses pulling trolleys through streets choked with noise, manure, and congestion. This prompted the city to pursue a then-controversial subway system.

Bill Bowerman’s daughter-in-law found the waffle iron he used to create a breakthrough shoe

Nike cofounder and University of Oregon track coach Bill Bowerman poured polyurethane into a waffle iron for his first attempt at creating the revolutionary waffle-knit sole. The waffle iron, which was found in his backyard, now sits in Nike’s headquarters.

Truth joined a utopian project in the early 1840s

The Northampton Association of Education and Industry was a brief utopian community in Massachusetts that united abolitionists, reformers, and intellectuals. Truth lived and worked alongside William Lloyd Garrison and Frederick Douglass; this helped to launch her career as a public speaker and activist.

George Pullman popularized tipping in the US with his Pullman sleeping car business

By 1868, Pullman, who operated luxury sleeping cars on the country’s growing network of railways, had started hiring formerly enslaved Black men as porters for extremely meager wages, working long hours in poor conditions. He encouraged wealthy passengers to tip them, helping institutionalize tipping in the US.

Erie Canal builders invented the “stump puller” to clear forests

One ingenious device created for the Erie Canal was the stump puller—a horse-powered machine using levers and chains to rip tree stumps from the ground.

The first US patent for a roller coaster was issued in January 1884

Despite their Russian origins, roller coasters are often associated with the US. This is in part thanks to a businessman and inventor named LaMarcus Thompson, who revolutionized the amusement industry in the US beginning with the Gravity Pleasure Switchback Railway at Coney Island. He is now known as the "father of the American roller coaster."

Working conditions on the Panama Canal, built between 1904 and 1914, were abysmal, with thousands of workers dying on the job.

Cyrus McCormick invented the mechanical reaper—and a territory-based sales force

In the 1830s, farmers were skeptical of new technology, so McCormick demonstrated the machine—described as a cross between a plow, a chariot, and a flying object—to prospective buyers. Long before modern sales norms existed, he divided the market into territories operated by agents who provided service on the machines, financing to expand the customer base, and product iteration based on feedback from regional agents.

The first 3D printing patent was filed in 1967

Wyn Swainson, an English literature graduate student, filed a patent in Denmark for a system that scans an object and uses the scanning data to rebuild it using lasers that harden light-sensitive plastic. However, he never developed a working prototype. The idea originated from wanting to produce recreations of sculptures.

Gladiator training is known mainly from art, not ancient texts

Since literary sources provide little information about gladiator training, scholars rely on visual evidence. This illustrated essay draws on artifacts from the Metropolitan Museum of Art, including an oil lamp from Cyprus showing a gladiator practicing against a wooden stake.

The first American roller coaster was built at Coney Island

LaMarcus Thompson was an inventor and businessman who developed the first US amusement park ride in the 19th century and sparked a booming business. Customers spent a nickel to coast on wheeled benches over gentle hills, leaving Thompson with around $600 per day in profits.

The bloody history of the true crime genre

The true crime genre appears to have crawled out of an unlocked closet between 1550 and 1700. Rising literacy rates and printing technologies during this period led to leaflets and ballads-turned-broadsides that graphically regurgitated the findings. These products often included woodcuts of the crime's "unsavory acts.". Such content was snapped up by the "artisan class and above" as poorer classes lacked the funds to fuel the hobby.

Running became more popular in the mid-20th century

Once considered a fringe activity, running eventually became an American interest. The trend was spurred in part by the 1966 book "Jogging," which was cowritten by Bill Bowerman, the cofounder of Nike.

When Dickens was 12, his father was imprisoned for debt

John Dickens was imprisoned at Marshalsea Debtors' Prison in London for failing to pay his debts. The experience forced the young Charles to leave school to help provide for his family. It also eventually informed his fiction, which often called for social reform, including the abolition of debtors' prisons.

Before alarm clocks, people relied more heavily on their circadian rhythms, humans hired to wake them, and on tools such as candle clocks that dropped pins in metal trays at roughly set intervals.

The Eighth Amendment prevents cruel and unusual punishment and was borrowed from England

The exact wording of the amendment came from England's Bill of Rights, written more than a century before America's. Today, the Eighth Amendment governs death penalty standards, prison conditions, and sentencing limits, though its interpretation remains actively contested.

Philosopher Bertrand Russell's 1932 case for laziness: with modern machinery, society could work four hours a day and still produce just as much.

Thomas Cook invented modern tourism in the 19th century by creating package tours and travel guides for aspiring travelers.

A 15th-century university student documented a surprisingly detailed fitness plan.

NYC's first subway was built largely in secret

In 1870, Alfred Ely Beach secretly tunneled under Broadway in 58 nights, disguising his pneumatic subway as a mail tube to fool Tammany Hall, the corrupt political machine that ran New York City. Nearly half a million New Yorkers rode it before politics, and a stock market crash killed the project.

Edwin Porter's 1903 adaptation of 'Uncle Tom's Cabin' was one of the earliest American full-length narrative films.

Basketball was invented in 1891 by Dr. James Naismith

When Dr. James Naismith hung two peach baskets at either end of a Springfield College gymnasium, he was just looking to keep the school’s athletes occupied and safe during harsh New England winters, but the game he created would quickly turn out to be a national sensation.

Their 1901 Wind Tunnel system revolutionized the study of aeronautics

Only the second to be built in the US, the wind tunnel allowed the brothers to study how air moves around more than 200 different wing shapes. This data helped them refine a key math equation, long held as the standard, that had been based only on one wing shape.