The Benjamin Franklin letter that anticipated daylight saving time

Daylight saving time, explained

Daylight saving time is supposed to help—but does it? Dive into the history, science, and consequences of this biannual aspect of American life (unless you're from Arizona or Hawaii).

Benjamin Franklin donated the books that became the first true public library in the US

In 1778, the town of Franklin, Massachusetts—named in his honor—asked Benjamin Franklin for a bell, but he donated a book collection instead, saying "sense" was more important than "sound." Residents voted in 1790 to make the books freely available to all, creating the nation's first public library.

Ben Franklin’s edit helped define the Declaration’s philosophy

When Thomas Jefferson drafted the Declaration, he wrote that its truths were “sacred and undeniable.” Benjamin Franklin urged replacing that phrase with “self-evident,” grounding the document in reason rather than religious authority and sharpening its Enlightenment logic.

Benjamin Franklin once wrote a satirical essay about passing gas

The Founding Father was asked to judge a contest for the Royal Academy of Brussels, but was incensed by one of the contest's questions, which he believed was highly impractical. In response, he wrote a piece suggesting that the most essential problem for scientists to solve was the "fetid Smell" that came with passing gas.

Financial advice from America’s founding fathers

Several of America's founding fathers—Benjamin Franklin, Thomas Jefferson, and Alexander Hamilton—espoused various financial platitudes during their lives. According to the financial publication Kiplinger, much of their advice holds up in modern times. This article rounds up a few wise words from the founding fathers (and even one first lady) about compound interest, taxes, and education. For money-management tips from America's early days, click here.

Adams' famous 1776 letter urged the Founders to 'remember the ladies'

In a March 1776 letter to John, Adams urged the Founders not to grant husbands unchecked power over their wives. Historians note it was not a demand for suffrage but a challenge to coverture—the legal doctrine that denied a married woman an independent identity.

Railroads and long-distance communication led to the development of time zones

Noon had been determined independently at each location based on when the sun was highest in the sky, but this became impractical for standardizing transportation. British star-mapping and navigation advancements established Greenwich as the prime meridian through Greenwich Mean Time, or GMT.

Thomas Jefferson delivered his 1801 State of the Union address in writing

In 1801, President Jefferson ended in-person State of the Union addresses, feeling they were too monarchial, and sent written messages instead—a practice that lasted until 1913. His first message was written and sent via his secretary, Meriwether Lewis, who later led the Lewis and Clark expedition.

Twain's ‘To the Person Sitting in the Darkness’ satirized American imperialism

The 1901 essay was a response to the Philippine-American War as well as Rudyard Kipling’s poem, “The White Man’s Burden,” which argued that Western nations had a moral duty to rescue non-Western nations from ignorance. Twain’s essay ironically encouraged lecturing citizens of the countries being invaded: “for the sake of the Business we must persuade him to look at the Philippine matter in another and healthier way. We must arrange his opinions for him.”

A collective effort from multiple scientists and inventors led to the light bulb

While Thomas Edison's thin carbon filament design made light bulbs commercially viable, prior contributions, such as Joseph Swan's development of the first successful incandescent filament electric lamp, made its eventual invention possible.

The lost medieval habit of 'two sleeps'

While most people accept a single seven-to-nine-hour nightly slumber is ideal, the approach is a relatively modern idea. For centuries, interrupted sleep was the norm, with historians uncovering descriptions of two periods of sleep during the normal 24-hour cycle.

Mark Twain spent decades feuding with the US Postal Service, convinced its costs and regulations were bureaucratic overreach.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight

Santa Claus originally wrote Christmas letters instead of receiving them

Parents originally used the letters as an opportunity to help discipline their children. Gifts eventually took on a more central role in the holiday, turning the letters into chances for kids to write Christmas wish lists.

Read Norman Rosenthal’s original 1984 paper describing SAD

The study helped formalize research and diagnosis of seasonal affective disorder, catalyzing the development of therapies (like bright light) and leading to broader adoption of effective treatments. It also helped connect the influence of light and seasons on biological mechanisms in the human body, spurring exploration of circadian rhythms.

A letter about a hurricane helped launch Hamilton's life in America

After a hurricane severely damaged the Caribbean island of St. Croix, Alexander Hamilton wrote a vivid letter that was later published and impressed local business leaders, who took up a collection to send the teenager to North America for schooling.

10 ways David Letterman changed late-night TV

Late-night TV is an American institution with its own tropes and traditions. While Johnny Carson is often noted as the model for late-night hosts, the modern notion of the format owes just as much (if not more) to David Letterman, who redefined the model in the early 1980s. This list from ABC News ranks the 10 ways Letterman accomplished that, using one of Letterman's classic bits to honor the man's legacy.

Candide's 'Voltaire' satirized blind optimism

The French philosopher’s most famous work, published in 1759, cataloged the journey of its titular hero, who was guided by a crackpot philosopher and the belief that optimism was the solution to life’s problems, despite all the evidence to the contrary.

250 years of world trade history

Adam Smith’s revolutionary ideas about free trade were often ignored throughout American history to protect domestic industry—until World War II caused a shift in sentiment about global trade.

19th-century Americans discovered tipping in Europe

Tipping waiters was a custom in medieval Europe, where masters gave their serfs money for exceptional work. Wealthy Americans vacationing in Europe in the mid-1800s discovered the behavior and brought it back to the US.

In 1939, an industry group asked Franklin Roosevelt to move Thanksgiving

Specifically, the Retail Dry Goods Association warned Franklin Roosevelt that if the holiday season didn’t begin until after Americans celebrated Thanksgiving on the traditional final Thursday in November, retail sales would tank. In 1941 Congress passed a law that made Thanksgiving the fourth rather than the last Thursday in November.

The American colonies recognized New Year’s Eve in March until 1752

England followed the Julian calendar, established by Julius Caesar, which had an inaccurate method of calculating leap years. Because of that, New Year’s Day eventually slipped into the spring and was linked with the Christian festival of the Annunciation, which was on March 25. That date carried over to the American colonies, which didn’t change the first day of the new year until 1752, after England adopted the newer Gregorian calendar.

1970s U.S. energy crisis sparked waves of green innovation

Faced with the 1973 Arab oil embargo, the U.S. responded with bold innovation—enacting a 55 mph speed limit, pioneering daylight saving time, boosting solar research, expanding nuclear power, and pushing energy-efficient building designs and automotive technologies

At age 22, Washington inadvertently started the French and Indian War

In 1754, while leading a small Virginia militia force in the Ohio Valley, Washington's troops ambushed a French scouting party. The clash heightened tensions between Britain and France and sparked a broader conflict that soon spread across North America, Europe, and parts of Africa and Asia.

The typo that scandalized a continent

One printing mistake in the 17th century proved so unfortunate it cost two men their careers and scandalized religious folks for centuries. Read the story here.

Meet the 56 signers of the Declaration of Independence—most of whom didn't put pen to paper until August 2, 1776—and see their original signatures.

One pop-culture historian fooled the nation with a fake origin story of April Fools' Day

In 1983, Joseph Boskin, a professor at Boston University, was interviewed by the Associated Press to discuss the history of April Fools'. Boskin shared a made-up story about a jester who took over Rome for a day and proclaimed that April 1 would henceforth serve as 24 hours of silliness. AP published the fib about "King Kugel," creating buzz and confusion for news outlets around the country.

The Times Square New Year's celebration originated as a party for The New York Times

The paper moved to the area, originally called Longacre Square, in 1904 and lobbied the city to rename it after the publication. The paper’s publisher, Alfred Ochs, threw a massive all-day party on New Year’s Eve to celebrate the opening of the paper’s headquarters, establishing the location as a destination for the holiday.

Before writing 'Walden,' transcendentalist Henry David Thoreau nearly burned down his hometown with a campfire that grew out of control.

The idea for the Federal Reserve was conceived in secret in 1910—with bankers donning duck hunt gear for disguise while traveling to a remote country club on Georgia's Jekyll Island

Learn more about the history of fireworks, which dates back to an accidental invention during an alchemist's quest for information about immortality.

After the Boston Tea Party, colonists switched to coffee, which became the main morning drink for revolutionaries.

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.

The rivalry between Alexander Hamilton and Thomas Jefferson centered on federalism—the question of how much power the federal government should hold relative to the states.

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.

Famed poet TS Eliot rejected the manuscript for George Orwell's political fable 'Animal Farm,' writing that its criticism of authoritarianism was not 'the right point of view.'

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

Jimmy Carter signed a 1978 bill that legalized home brewing, a move credited with kick-starting the craft beer industry.

The concept of phantom limbs, the perception that amputated limbs are still present, dates back to a French military surgeon in the 16th century.

During the French Revolution, a botanist's letter asking about "dear Rhus" (poison ivy) was intercepted, leading authorities to suspect he was conspiring with the Russians.

20,000 letters to the advice columnist 'Dear Abby' provide insight into prevailing sex, religion, and LGBTQ fears, anxieties, and concerns from the 1950s onward.

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.

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

'Grand Canyon of the Yellowstone,' a work by American painter Thomas Moran, inspired Congress to establish Yellowstone National Park.

'Saturday Night Fever,' the 1977 film that introduced disco to the mainstream, was based on a fabricated magazine story.

Clever Hans was a 1900s horse that was believed to be able to solve math equations, tell time, and read and comprehend German, until a psychology student discovered how he got his answers.

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

After NASA's Voyager 1 captured Earth as a single pixel as it left the solar system in 1990, astronomer Carl Sagan used the image to reflect on humanity's fragility and the responsibility to protect 'the only world we've ever known.'

Explore a list of the 100 best novels of all time, compiled by some of the world's best living writers, including Salman Rushdie, Stephen King, and Jennifer Egan.

El Niño, Spanish for 'the boy,' was named after Jesus Christ because the phenomenon resembled the weather changes observed around Christmastime.