Tesla's first successful AC prototype used a metal shoe polish tin for a rotor

George Westinghouse purchased Tesla's AC technology patents for $60,000

The seven patents in alternating current motors and power transmission formed the basis for a system of technologies including generators, transformers, and lighting. Nikola Tesla spent half the funds on a new laboratory to develop new inventions.

Tesla's alternating current power's most of the world's electric grids

In 1879, Thomas Edison’s light bulb relied on direct current, but such currents can't efficiently transmit power over long distances. Nikola Tesla introduced alternating current, which feature far fewer energy loses. Despite Edison’s attempts to discredit AC, Tesla proved its efficiency by lighting the 1893 Chicago World’s Fair.

A pair of engineers began Tesla to prove the viability of electric vehicles

Martin Eberhard and Marc Tarpenning sought to design a high-end electric sports car for environmentally motivated, affluent buyers. The Tesla Roadster would be the first highway-legal car to use lithium-ion batteries.

Thomas Edison publicly executed animals with AC to convince the public of its dangers

J.P. Morgan first backed Thomas Edison's direct current system, seeing electricity's potential to usurp John D. Rockefeller's kerosene empire. Despite the investments and smear campaign against alternating current, alternating current ultimately won public support after lighting the 1893 World's Fair, after which Morgan would fund Tesla's wireless transmission tower.

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."

The world's first AC hydroelectric power plant incorporated Tesla's engineering

Built at Niagara Falls, New York, the plant alternating current electricity was hailed as the future of power generation. Tesla's fascination with Niagara Falls is traced to his seeing a photo of the waterfalls when he was still a child.

Nikola Tesla embraced showmanship when promoting ideas ahead of their time

He once electrified himself during a live demonstration to illustrate the safety and power of alternating current, and his presentations often featured arcing coils, glowing lights, and bold claims about a future of wireless power.

Tesla's lack of business savvy and inability to commercialize led to his obscurity

For decades, despite pioneering technologies for large-scale electrical systems and telecommunications, Nikola Tesla had been forgotten to history. Rather than monetizing his work and becoming more well known, his inventor-first mentality saw him sell off lucrative patents to fund new experiments in the short term.

The Tesla coil was the first system to wireless transmit electricity

Developed in 1891, the system effectively consists of two open electric circuits with a gap of air between them. When a high enough voltage is built up, air becomes a conductor and sparks of electricity are generated.

Despite promoting alternative current, Nikola Tesla did not invent it

The technology was developed by Hippolyte Pixii in 1832, almost 25 years before Tesla was born. Other myths about Tesla include that he invented the transformer, radio, and the induction coil, which was invented by Nicholas Callan in 1836.

Nikola Tesla was born in modern-day Croatia and moved to the US in 1884

His interest in electricity came from his mother, who invented small household appliances during Tesla's upbringing. Upon arriving in America, he began working for and improving upon the electrical inventions made in Thomas Edison's lab.

Nikola Tesla's original laboratory was recognized as a historical site in 2018

Beginning in 1901, the Wardenclyffe Tower was built on Long Island, New York to transmit electrical power through Earth's atmosphere. The project was abandoned before becoming operational due to limited funding, and was demolished for scrap in 1917 to help pay off Tesla's debts.

Learn about the relationship between Thomas Edison and Henry Ford

Despite their 16-year age difference, legendary inventor Thomas Edison and Henry Ford developed a close relationship after meeting at a convention in New York. The two—alongside environmentalist John Burroughs and Harvey Firestone, the founder of Firestone Tire—were known as the "Four Vagabonds" and were famous for their long roadtrips, which were often highly publicized.

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 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.

Benjamin Franklin described a series of static electricity storage jars as 'batteries'

Discovered over 50 years before the first electrochemical cell was invented, Leyden jars stored electric charge between the metals inside and outside a liquid-filled container. Franklin was the first to use the term "battery" in an electrical sense, though his multiple-jar device—lacking chemical reactions—was actually a series of capacitors.

The first rooftop solar panels were installed in 1883

In 1883, New York inventor Charles Fritts created the first solar cell by coating selenium with a thin layer of gold. The cell achieved energy conversion rates of 1 to 2% compared to the 15 to 20% of modern photovoltaics.

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.

Electric vehicle systems run on five key components

The system is made up of a charger—converting AC into DC—a battery, a power control unit, motor(s), and a single gear. A complex gearbox is not needed because electric motors are efficient at operating across a range of speeds.

The Wright brothers began as bicycle manufacturers in Dayton, Ohio

In the late 1800s, the duo managed several bike shops in the Dayton, Ohio area, where they would sharpen their teeth in engineering and design. Some of their earliest aviation efforts were funded by their bicycle business and initiated in their bike shops.

Watch a tour of a battery manufacturing gigafactory

Inside Contemporary Amperex Technology Limited's facility, China's largest EV battery manufacturer uses slurry mixing, "jelly rolling," electrolyte injection, and other techniques and equipment to transform raw metals such as lithium and magnesium into approximately 2.2 million electrochemical cells daily.

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.

How to make your own DIY ionic thruster

In the search for more efficient, sustainable types of propulsive thrust, scientists have dabbled in developing engines using ionic thrust, a type of propulsion using the attractive force of oppositely charged ions. First introduced by a Russian...

A NASA engineer came up with the idea for the air-cushioned Nike Air shoes

Frank Rudy came to Nike with the idea of using air capsules in the soles of running shoes to provide better cushioning. The first shoe with this technology, the Tailwind, came out in 1979.

The American Research and Development Corporation is considered the first modern VC firm

Best known for investing in companies that wanted to utilize some of the technology developed during World War II, the ARDC’s cofounders all held prestigious positions at places like MIT and the Federal Reserve Bank of Boston.

The carbon footprint of manufacturing a wind turbine is offset within seven months

Despite initial carbon emissions during manufacturing, wind turbines generate nearly zero pollution across their 20- to 25-year lifetimes. Offsets occur when turbines replace energy generation from coal and natural gas plants, which emit carbon dioxide.

Electrical grids worldwide must double their power delivery capacity by 2050 to meet surging demand from AI and electric vehicles.

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

The name 'Silicon Valley' arose from the founding of Shockley Semiconductor Laboratory in Fairchild Semiconductor in 1956-57, founded near Stanford University in Palo Alto

Walt Disney's early film 'Alice's Wonderland' was a groundbreaking innovation in the silent film era

Planeterrellas create artificial auroras that mimic the atmospheric displays of light by setting up an electric field between two metal balls in a jar filled with a small amount of air.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

Legendary architect Frank Lloyd Wright designed the SC Johnson headquarters in Wisconsin, aiming to make a cathedral-like workplace

SpaceX's S-1 or 'prospectus' revealed many previously unknown details about the company, including its unprofitability despite doing $18.7B in revenue in 2025, exactly how many voting shares Elon Musk will have in the company (roughly 85%), and more.

Against his wishes, Albert Einstein's brain was removed before his cremation, and the pathologist responsible stored it for decades in mason jars within a beer cooler.

English mathematician Ada Lovelace wrote the first computer algorithm a century before computers existed and hypothesized that computing devices would one day be able to compose music—foreseeing the generative AI systems of today.

Many legends about George Washington, including his supposed wooden teeth and the story of cutting down the cherry tree, lack evidence.

While the first exchange-traded fund (a 'basket' of different assets that can be bought and sold on a stock exchange) in the US only launched in 1993, the global ETF market has grown to more than $10T in the short time since.

One disco producer saw 'Star Wars' four times on its opening weekend and was so inspired that he recorded the album 'Star Wars and Other Intergalactic Funk,' which produced a chart-topping single.

Abraham Lincoln was almost assassinated weeks before his inauguration as he traveled from Illinois to DC through Baltimore in 1861; it took two independent claims for Lincoln to be convinced the threat was real

The animatronic shark from Steven Spielberg's 'Jaws,' the first modern blockbuster, was a complex underwater apparatus called 'Bruce.'

The American cockroach is actually from Africa, an apparent hitchhiker aboard ships carrying enslaved people, with evidence suggesting the bug may have arrived in the New World as early as the 1600s.

Objects can be 3D printed with light by projecting 2D computerized tomography (CT) scans onto rotating cylinders of resin, which solidify upon exposure.

Pure water does not conduct electricity because this flow of energy requires the movement of charged particles, and water is a neutral molecule.

For centuries, Niagara Falls has been a magnet for daredevils seeking to conquer one of nature's most powerful wonders, with its 200-foot drop and water rushing at 32 feet per second with 280 tons of force.

When a Paris department store hesitated to sell Estée Lauder's perfume, she 'accidentally' broke a bottle, causing the smell to spread throughout the store and shoppers to start asking to buy the scent.

Warren Buffett's former professor Benjamin Graham is known as the 'father of value investing,' a strategy in which investors seek to buy stocks trading below their intrinsic worth.

After 25 people used virtual reality headsets to practice flying with virtual wings—flapping their arms—their visual cortex responded to the wings almost as if they were real arms, treating them as body parts.

The word 'jazz' evolved from 'jasm,' 19th-century American slang for 'energy'

The use of fungi to detoxify land and water—a process known as mycoremediation—has been used to clean up natural resources affected by the 2025 California wildfires.