The massive gathering that rang in the first Earth Day

Earth Day has become the largest civic event in the world

What began in 1970 with 20 million Americans now involves more than 1 billion participants across over 190 countries each year. Earth Day now encompasses rallies, cleanups, and climate actions worldwide.

Earth Day began as a grassroots protest coordinated by a 25-year-old

With experience as a Vietnam activist and inspired by his upbringing in a polluted mill town, Denis Hayes drew 20 million participants to the first Earth Day after being selected to organize it. The momentum of the event—celebrated across about 10,000 schools and universities—pressured Congress to pass environmental legislation.

Hear firsthand accounts from the 1963 March on Washington

This video features stories from people who attended the 1963 March on Washington—the largest demonstration in US history at the time—capturing what it felt like to witness a pivotal moment in the Civil Rights movement as it unfolded.

Live Aid featured 16 hours of live music across two continents

The 1985 benefit concerts took place in London and Philadelphia, and performances from both locations were televised simultaneously.

Delegates at the First Continental Congress affirmed loyalty to Britain while protesting

Delegates met in Philadelphia in 1774 to debate how to respond to British acts clamping down on trade and increasing taxes. The result of the congress was to call for the formation of colonial militias and to embargo British goods. Delegates also adopted the Declaration of Rights and Grievances, though there was broad disagreement about how to respond to Britain’s policies.

A virtual tour of Philadelphia’s American Revolution Museum

Philadelphia’s Old City hosts one of the largest museums on the American Revolution. This virtual tour allows you to view the museum’s exhibits as if you were there by zooming in on descriptions, browsing images, and learning about artifacts, portraits, and more.

Why people hated permanent daylight saving time in 1974

Messing with the amount of daylight each day has consequences, as America found out in 1974 when it first passed all-year daylight saving time. See why it was revoked less than a year later.

The first Macy’s Thanksgiving Day Parade took place in 1924

It was originally intended to promote Macy’s upcoming holiday sales. Although it took place on Thanksgiving Day, the parade was initially called the Macy’s Christmas Parade—the name didn’t change until 1927.

Every Oktoberfest starts with a tap

Crowds rush excitedly toward the tents to count down to the ceremonial first tap, with the mayor declaring “O’zapft is!” This short documentary walks you through the tradition at the 2019 festival. Don’t miss the impressive shots of servers carrying dozens of beer steins at once to their thirsty patrons. Prost!

Sri Swami Satchidananda gave the opening remarks at the first Woodstock

The yoga guru was invited to begin the legendary 1969 festival and told the massive crowd he believed music “is a celestial sound and it is the sound that controls the whole universe, not atomic vibrations.” The speech leaned into yoga as a philosophy, one that the many concertgoers in attendance could use to guide their collective desire for peace.

The story of the debut 1967 Consumer Electronics Show

Read an account of the origins of the first CES in New York in 1967, a story which is surprisingly difficult to find information about.

Voyager 1 captured Earth as a 'Pale Blue Dot' from 6 billion kilometers away

On Feb. 14, 1990, NASA's Voyager 1 space probe took the farthest photo of Earth ever captured. Earth appears so small in the image that it takes up less than a single pixel out of 640,000 in the photo's frame.

Watch a 1986 television special about the discovery of the ozone hole

The groundbreaking discovery of the Antarctic ozone hole in the mid-1980s marked a critical turning point, galvanizing international action to address the ozone-depleting properties of chlorofluorocarbons, which had been identified about a decade earlier. This environmental crisis was brought vividly to public attention through media pieces like this one.

Watch the evolution of the NFL Draft

The NFL Draft evolved from a small group of team representatives huddled in a Philadelphia hotel ballroom in 1936 into a three-day primetime spectacle that regularly draws over 500,000 fans and 13 million TV viewers. Explore how it became the event it is today.

J.I. Rodale helped pioneer organic farming in the US

Rodale began using the term “organic” in the 1940s to describe farming practices that avoided the use of pesticides and chemicals, which he believed were dangerous. Rodale used a 63-acre farm in Emmaus, Pennsylvania, to cultivate organic food and established a magazine, Organic Farming and Gardening, as well as a foundation based on a simple motto: “Healthy Soil = Healthy Food = Healthy People.”

How Pearl Jam helped inspire Coachella

Pearl Jam hasn't yet played Coachella, but they did play a major role in inspiring the annual music festival. The story goes back to 1993, when Pearl Jam was protesting all Ticketmaster-owned venues, which made playing a Los Angeles-area date next to impossible. That led concert promoter Goldenvoice to the Empire Polo Club in Indio, California, where the first Coachella took place six years later.

Portugal's 1775 earthquake is considered Europe's first modern natural disaster

An 8.5-magnitude earthquake off the Portuguese coast nearly destroyed Lisbon, killing thousands, creating 16-foot-wide fissures in the city, and triggering a massive tsunami. Historians credit it with jump-starting the Enlightenment in the region, with many thinkers seeking natural explanations.

YouTube's first-ever video was nothing special

YouTube has grown into a cultural force in its two-plus decades of existence. Its beginnings, though, were modest, especially its first video: a 19-second clip about a visit to the San Diego Zoo. This brief resource explains the origins and longtail impact of "Me at the zoo," a simple video uploaded by Jawed Karim on April 23, 2005.

A live bald eagle named Peter once lived at the original Philadelphia Mint

During the day, he flew around the city, but at night he slept soundly in the first-ever US Mint building. Although he died at some point in the early to mid-1800s, mint artists still study him today when designing new eagle imagery for coins. Luckily, that’s not too difficult, given that mint employees pitched in to stuff him at the time of his death.

'Streets of Philadelphia' won an Academy Award in 1994

The song was written for “Philadelphia,” a 1993 film starring Tom Hanks and Denzel Washington, and narrates the emotional journey of Hanks’ character, a gay man who’s fired after his employer learns that he has AIDS. The song won the Oscar for best original song the following year.

Pennsylvania's traditions of dropping foods for New Year's

Pennsylvania towns celebrate New Year's Eve with unique, food-themed drop (or raise) events that showcase local culinary pride. The town of Lebanon drops 250 pounds of bologna attached to a disco ball, with a crane, in a celebration of their local smoked sausage tradition. Find out several more wild traditions in this quick article.

Yellowstone was the world's first national park

Before it was designated as such, it was home to 27 Indigenous tribes, including the Blackfeet, Crow, and Nez Perce. European trappers and traders traveling west were entranced by the area’s stunning beauty and natural resources, fueling a push for the government to preserve the land for future generations.

How the ancients calculated Earth's size correctly

Watch this seven-minute video to hear Carl Sagan explain how ancient Greek polymath Eratosthenes correctly calculated the size of the Earth in the third century BCE. At some point, Eratosthenes noticed a discrepancy in the length of shadows cast in different cities during the summer solstice. This observation grew into a simple experiment that enabled Eratosthenes, the head librarian at the Library of Alexandria, to calculate the Earth's size precisely.

Hear the story of the first paramedic services, which grew out of a community training program in 1960s Pittsburgh

Before 911 existed, cities sent police cars or hearses from funeral homes to medical emergencies. In 1967, a group of young Black men in Pittsburgh changed that, developing the training protocols and lifesaving techniques that became the foundation of modern EMT response.

Sun Ra and his band operated a grocery store in Philadelphia

Ra arrived in Philadelphia in 1968, settling into a home in the city's Germantown neighborhood with his band, the Arkestra, where they would practice for hours on end. The ban also operated a grocery store called Pahroah's Den, which sold produce, candy, and Sun Ra records. You can see scenes from the store, along with several astonishing performances, in the 1980 documentary "A Joyful Noise."

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," resulting in countless memes, the creation of a music festival, and eventually the arrests of those who did try to approach the area.

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.'

See the most iconic photos from four decades of LIFE magazine

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

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.

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.

70 years ago today, city officials in Santa Cruz, California, banned rock 'n' roll to protect its youth from corruption after witnessing a 'provocative' concert the night before.

A researcher recently discovered an interview from 1967 between groundbreaking journalist Joan Didion and the Grateful Dead, years before the band became an institution.

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

The US first hosted the World Cup in 1994, a tournament that lives in soccer infamy for its poor planning and the murder of Colombian player Andres Escobar, who'd accidentally scored on his own net.

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.

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

Watch a 1934 short film starring jazz legend Cab Calloway, a major figure in the Harlem Renaissance's music scene

Fish populations in the Great Barrier Reef have increased after installing waterproof speakers on the ocean floor that played recordings of sounds from healthy coral reefs.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

Graffiti dates back to at least ancient Pompeii, where citizens scrawled messages to one another on public walls

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

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.

Exploring the Larry Bird punch that almost changed March Madness

Listen to an in-depth conversation on the links between Parkinson's disease and herbicide exposure and the challenging pace of scientific investigation.

See how fireworks are made and learn how metals like magnesium and copper are responsible for different colors.

The first robot in literature may have been a 'mechanical man' in 1907's 'Ozma of Oz,' a book in L Frank Baum's 'Wizard of Oz' series.

Double world record holder Hunter Ewen helped conquer his fear of balloons, called globophobia, by training to win Guinness World Record titles for balloon inflation.

Scientists can determine Earth's past climate conditions by analyzing air trapped in microscopic bubbles within ice cores—columns of compressed snow layers that build up over hundreds of thousands of years.

See a 3D reconstruction of Tenochtitlan, the Aztec capital that was home to an estimated population of 200,000 to 400,000.