Although the moon passes between the sun and Earth each month, its orbit is tilted by five degrees, preventing Earth from experiencing a solar eclipse each month.

Researchers generally group gut bacteria into six different categories, with varying amounts of these microbes residing in different parts of the digestive tract.

Explore an interactive forecast of the future of the universe, from the return of Halley's Comet to the last light in the cosmos.

The world's largest waterfall is in the ocean and is more than three times the height of Angel Falls, the largest waterfall on land.

Humans tend to imagine aliens as humanlike, but that's probably unlikely. Three different hypothetical planets show how aliens' bodies could take many forms.

'Golden blood' is the rarest blood type in the world—fewer than 50 people are known to have it.

The collapse of gas bubbles in the joint synovial fluid causes 'cracking' knuckles.

See a 3D reconstruction of Tenochtitlan, the Aztec capital

All rainbows are 'raincircles' caused by water droplets separating white sunlight into a spectrum of colors, but Earth's surface blocks the bottom half of the circle from our line of sight.

The US has discontinued a variety of different currency denominations over the years—including a $100K bill.

Find out how important you are to AI tools when they generate text responses with this tool, which estimates the weights of people's names.

Semaglutides, which belong to a class of drugs called GLP-1s, are prescribed for weight loss in combination with diet and exercise because they trigger the release of the appetite-suppressing hormone incretin.

Explore a collection of famous literary maps, including original images from 'Treasure Island,' 'The Swiss Family Robinson, ' and 'Walden.'

Watch a two-year time-lapse of a pinecone seed transforming into a pine tree.

Hear 50 years of iconic hip-hop samples, the genre's foundational looped tracks.

Fecal transplants can help treat infections by transplanting healthy gut bacteria from a donor into a patient's gastrointestinal tract using samples of human waste, which are turned into a liquid mixture and often delivered via a colonoscopy procedure.

Watch 4-plus decades of Pixar's opening logos.

There are up to 100 trillion microbes in the gut, and maintaining the relative balance in this ecosystem is important for our health.

See where your state ranked in an analysis of the best public school systems in the US.

Explore the history of American restaurants through an archive of menus dating back to the early 1800s.

Watch Dr. Laurence Peter explain his 'Peter Principle,' which states that people are promoted to their level of incompetence and explains why bosses aren't always good at their jobs.

Located on Ross Island in Antarctica, Mount Erebus is the southernmost active volcano on Earth and features a lava lake—one of eight known worldwide as of 2026—that erupts regularly.

Plato's famous allegory of the cave is a metaphor exploring the value of truth over ignorance.

There are 'YouTube camps' that teach children how to create content for the video platform.

See a breakdown of how some of the most common food items are traded across the globe, including the key trade relationships for each item.

Simulations suggest that a paper airplane launched from the International Space Station would maintain its orientation and gradually descend for 3.5 days before chaotically tumbling down and burning up.

Experience a century of America's healthcare advances with this medical visualization, tracing a sampling of healthcare innovations from head to toe.

The final shots of the Civil War were fired in the Arctic over 2 months after the South's surrender.

Relax to a livestream of brown bears chilling in Katmai National Park in Alaska.

Watch Bruce Springsteen's 1985 performance of Woody Guthrie's 'This Land Is Your Land,' which he calls 'the greatest song ever written about America.'

The tallest tsunami in recorded history was 524 meters (1,720 feet) high—taller than the Empire State Building—and occurred in Lituya Bay, Alaska, in 1958 after an earthquake dislodged a rockface into the water.

Emanuel Leutze's painting 'Washington Crossing the Delaware' is one of the defining images of the Revolutionary War.

If a source of music traveled past someone at twice the speed of sound, assuming sufficiently sensitive hearing and powerful equipment, they would hear the music backward.

Visualize the path of every solar eclipse from 1900 to 2099 and see what each looks like when observed from different locations on Earth.

On planets in systems with two stars, such as the fictional Tatooine from 'Star Wars,' observers would see overlapping rainbows and double rainbows.

Play the role of a student as you try to navigate college and remain debt-free.

Sea stars are invertebrates—they lack a backbone—and while most exhibit pentametric radial symmetry due to having five arms radiating from a central disk, some can possess more than 40.

Cats have a mutation that prevents them from tasting sweetness, and goldfish rank among the world's supertasters.

Lesser-known phobias include turophobia, or the fear of cheese, and nomophobia, the fear of being without your cell phone.

Check out some of the best books that can be read in a single day, with titles from Han Kang, Denis Johnson, Muriel Spark, and more.