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

Here are some tips from Pew Research to help you distinguish between a good poll and an unreliable one.

Watch what would happen if you literally had all the money in the world.

The US jobs projected to shrink the fastest over the next decade include typists and word processors.

'Bibliotherapy' is of increasing interest as a way to improve mental health and help navigate complex life situations—with people immersing themselves in the experiences of fictional characters or nonfiction and self-help books to find relief and gain personal insights.

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

Examine this captivating animation 'building' a human—illustrating the roughly 40 weeks of fetal development.

Watch the many different civilizations around the Mediterranean shift power from the year 2500 BCE to 0 BCE in this animated map.

Stonehenge was built using giant wooden rollers and precisely carved tongue-and-groove joints to lock the stones in place.

This short animation shows how human beings managed to lug 30-ton stones over miles of prehistoric English countryside and stand them up The Stone Age engineering involved using giant wooden rollers and carving precisely interlocking tongue-and-groove joints to hold the heavy stones in place.

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

Author David Foster Wallace's 'This Is Water' speech provides guidance for adulthood.

One of the most famous portraits ever taken is 'Afghan Girl' (1984) by Steve McCurry, yet the subject Sharbat Gula went much of her life without being identified or benefitting from the image's success.

One of the most famous portraits ever taken is "Afghan Girl" by Steve McCurry. Sharbat Gula, the subject of the photo, was not credited until 2002 for her role in the famous National Geographic cover, and continued to live in poverty after the photo was taken.

Streaming service Netflix's sound logo 'Tudum' was designed as a key sonic differentiator.

Explore Lewis and Clark's 8,000-mile journey in Google Earth.

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

Metamorphosis evolved over millions of years as species that hatched as smaller versions of adults started exhibiting genetic mutations that differentiated juvenile and adult bodies.

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

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

Explore how temperatures compare to historical averages in cities worldwide with this interactive global monitor.

You may be better at spotting a lie when listening to a speaker's voice inflections rather than watching for facial and body cues.

If the moon were less than one-twelfth its current distance from Earth, the planet's tidal forces would overcome the moon's internal gravity, tearing it apart and forming a ring of debris.

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.

Lake Sørvágsvatn sits about 32 meters (105 feet) above sea level, but the taller surrounding cliffs create an optical illusion that makes it appear to float much higher above the ocean.

Humans may have as many as 100,000 to 150,000 individual hairs on our scalps, growing at a rate of roughly 1 centimeter per month.

Explore (and debunk) the world's most contagious misconceptions—from the 5-second rule to sugar rushes—on this interactive site. Click on each misconception for further evidence.

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.

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.

Pregnancy makes someone more attractive to the mosquito species that transmits malaria.

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

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.

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

Male pattern baldness accounts for more than 95% of hair loss in men and is characterized by thinning hair, hair loss, and a receding hairline.

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

Robert Smalls escaped slavery by piloting a stolen Confederate ship to freedom, then became an influential Black political leader during Reconstruction.

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

The Berlin Wall physically separated East and West Berlin for nearly three decades, preventing East Germans from fleeing to the West and earning the nickname 'the Iron Curtain.'

Watch President John F. Kennedy's speech on going to the moon

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.

Explore how the most commonly used words in the English language have changed from the 1950s to 2023.

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