No one showed up to the party for time travelers organized by Stephen Hawking

What Stephen Hawking said about time travel

When renowned theoretical physicist Stephen Hawking did not rule out the possibility of time travel in his posthumous book Brief Answers to the Big Questions, many hopefuls got excited. But, unfortunately for them, Hawking believed that yet-to-be discovered laws of physics will prove time travel impossible. This piece outlines some practicalities about the speed of light and wormholes that lend way to Hawking’s prediction.

English cosmologist Stephen Hawking (1942-2018) jokes about alien sightings

"I am discounting the reports of UFOs. Why would they appear to only cranks and weirdos?"

A blend of brilliance and humor made Stephen Hawking's cameos unforgettable

Throughout his life, he appeared in numerous pop culture moments—from "The Simpsons" to "The Big Bang Theory"—showing his talent for comedy and his love of science outreach. He was the only person to play himself on "Star Trek: The Next Generation," even writing some of his own lines.

Stephen Hawking on the need to explore space

Should we be content with being cosmic couch potatoes? In this interview, the late Professor Stephen Hawking lays out the case for continued and increased human space exploration, despite its cost and challenges.

Stephen Hawking's biggest discovery—Hawking radiation—came from a major mistake

Hawking radiation may not have been discovered without Jacob Bekenstein first convincing Stephen Hawking that black holes follow the laws of thermodynamics. The graduate student showed that black holes could shrink, setting the stage for Hawking’s most significant contribution.

Time seems to stop for objects at the event horizon of black holes

At that location, the warping of space-time is so severe that the entirety of an object's space-time motion is solely through space, leaving it immobile in the time dimension. Faraway observers looking at the object would see it appear frozen before slowly dimming and reddening.

The first image of a black hole was captured by creating an Earth-sized virtual observatory from a network of eight radio telescopes.

Quantum mechanics-based technology may explain the Fermi paradox

It describes the discrepancy between the high likelihood of life beyond Earth given the vastness of the universe and the lack of evidence for such life, since extraterrestrial civilizations have not communicated with us. However, quantum communication—a more information-dense and effective method than classical means—requires massive receivers and very narrow signals, which would easily miss Earth, making a lack of signals expected.

View a timeline of particle discoveries through the Higgs boson in 2012

With few exceptions, the elementary particles that make up the Standard Model were theorized or predicted to exist before their eventual discovery in high-energy environments. These predictions were often the result of inferences drawn from already accepted mathematical models.

Researchers once thought Stonehenge functioned as a precise astronomical computer

In the 1960s, scientists used early computers to analyze the stone layout at Stonehenge, arguing it could predict eclipses and other celestial events. This BBC Sky at Night Magazine piece explains how the theory arose—and why scholars now doubt it.

Objects moving relative to one another will not agree on the simultaneity of events

Space and time shift when switching from a nonmoving to a moving perspective, causing events that seem to occur simultaneously for one person not to appear that way for someone else. This also means one person's present could be another's future, ensuring all of time already exists.

An 87-year-old widower goes viral for hand-delivering party invitations door to door that read "4 pm until the cops arrive"

A man knocked on his neighbor's door to offer a paper invitation to a winter-themed party he was throwing. "My wife is gone now, so it gives me something to keep me busy," he later explained. "I'm going to get these people in one room, and maybe they'll get to know each other." The viral experience has since brought him fan mail and party treats.

Why is there a regular event to call Houdini from beyond the grave?

An annual seance on the anniversary of Harry Houdini's Halloween death seeks to communicate with the great escapologist from the great beyond. This podcast episode explores why the Hungarian illusionist wanted these magical rites held after his...

The first image of a black hole was captured by creating an Earth-sized virtual observatory from a network of eight radio telescopes.

Why Henry David Thoreau was not a hermit

When many people think of "Walden," they think of a man who intentionally exiled himself from society. But that's inaccurate. Thoreau regularly welcomed guests and explained that he kept three chairs in his modest cabin: "one for solitude, two for friendship, three for society."

Long before Coachella, Steve Wozniak attempted a similarly-minded festival

In 1982, Apple cofounder Steve Wozniak was on a hiatus from Apple after a near-fatal plane crash. In his spare time, he decided to throw a festival that would bring together cutting-edge music and technology—a Woodstock for the 1980s. The result was the US Festival, an early ancestor of Coachella that brought world-class acts like Tom Petty, Fleetwood Mac, Talking Heads, the Grateful Dead, and the Ramones to a rustic venue outside Los Angeles.

Only allowing three recipients causes the Nobel Prize to overlook team discoveries

While science has grown more inclusive and collaborative, the Nobel Prize system still struggles with outdated practices, such as secrecy and a rigid limit on awardees. This restriction sidelines many deserving scientists, especially in complex projects like the human genome or gravitational waves.

Bill Nye received a star on the Hollywood Walk of Fame in 2025

The Hollywood Chamber of Commerce awarded its 2,821st star to Nye for his "dedication in making science accessible and entertaining for all ages through his iconic educational show." Former "Almost Live!" colleagues Joel McHale and Ross Shafer spoke in Nye's honor during the ceremony.

Explore a timeline of the International Space Station National Lab

In 1984, President Ronald Reagan called for establishing a human presence in space, which began with NASA astronaut Bill Shepherd and Russian cosmonauts Yuri Gidzenko and Sergei Krikalev on November 2, 2000. Humans have continuously occupied the ISS every day since.

Imagine thousands of alternate histories of the world

AlternateHistory.com has hosted fan-written "what if" timelines, discussions, and speculative fiction since 2000, making it the largest online gathering of alternate history enthusiasts, with over 10,000 active members and a wiki cataloging hundreds of user-created scenarios. Two highlights to pique your interest: what if the Vikings had settled North America? What would have had to happen for the storyline of George Orwell's "1984" to come true?

ChatGPT was conceived over dinner at a Silicon Valley hotel

A guest list of tech leaders, including Elon Musk, Peter Thiel, and LinkedIn cofounder Reid Hoffman, met to discuss how to counter Google's efforts to create human-level cognition systems. The group initially committed a reported $1B to launch the effort.

See who attended Davos 2025

Each year, Davos draws one of the most exclusive guest lists in the world. In 2025, attendees included 60 heads of state, over 900 CEOs and corporate chairs, and top leaders from global civil society, who gathered in the Swiss Alps.

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.

Between 1993 and 2009, Hubble was serviced for repairs and upgrades 5 times

Across 21 space walks totaling 144 hours, replacement instruments, gyroscopes, solar arrays, batteries, and computer systems have helped extend the Hubble Space Telescope's operational lifetime beyond its planned 15 years.

The history of the White House Hanukkah party

Despite celebrating Christmas for hundreds of years, the US Presidential White House didn't have its first Hanukkah celebration until 1979, when Jimmy Carter oversaw the lighting of a menorah. Since then, the tradition has expanded, including lessons on playing with dreidels and big parties. See a timeline of the events here.

Why don't humans hibernate?

Hibernation is a superpower in the animal world that allows certain species to time travel from difficult times to abundance. This essay in Aeon explains this helpful natural process and why humanity's technological advancements may have hindered our ability to participate in the practice. Learn about the rising interest in human hibernation as a result of modern adversity, and if it could potentially become a reality.

A 2019 meme about Area 51 led to arrests and a music festival

A 2019 Facebook event called on attendees to "Storm Area 51, They Can't Stop All of Us," spawning countless memes. Millions marked themselves as "going," and seven were arrested at a gate into the area. It also inspired a music festival attended by more than 7,000 people.

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.

Track the location of the Voyager probes, currently between 13 and 15 billion miles away from Earth.

Before humans, the Soviet Union and the United States sent animals—including apes, dogs, and cats—to space during the Space Race.

In 2009, the nation was gripped by the story of a missing young boy who was believed to be floating over Colorado in a homemade balloon, until it was revealed that he was at home the whole time.

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.

Human-to-human transmission of hantavirus remains extremely rare, so the 2026 hantavirus cruise ship outbreak doesn't mean we're facing a COVID-style pandemic risk.

American dance legend Martha Graham, sometimes called 'the Picasso of dance,' refused to perform at the 1936 Olympics in Berlin and conceived the piece 'Chronicle' in response to the experience.

Frank Lloyd Wright's houses are historically hard to sell because they're old, subject to local landmark commissions, and often unfashionable

Despite being favored by 87% of Americans, Congress does not have term limits.

While atoms are normally made of protons, neutrons, and electrons, exotic ones have been built with antimatter—alternate versions of normal matter that live for fractions of a second and are about a billion times as rare.

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

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.

A vending machine run with Anthropic's AI went out of business after it was convinced to give away items for free and sell a video game console.

Take a 3D tour of the Hajj, Islam's annual pilgrimage to Mecca, undertaken by over 1.5 million Muslims.

Hotels in Cannes, the glamorous city on the French Riviera, hire hawks to ward off seagulls during the city's famous film festival.

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

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

Watch contemporary footage covering the US-backed Shah of Iran fleeing the country in the face of the 1979 Iranian Revolution

Existentialist writer Jean-Paul Sartre coined the famous phrase 'Hell is—other people' in his play 'No Exit'

In 1984, Operation Smash Hit intentionally crashed a 239-ton train into a nuclear waste canister at 100 miles per hour to prove the canister's safety, which remained completely intact and lost just 0.29 of its 100 pounds of pressure.

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

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.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.