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

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.

Use this tool to calculate the dollar value of your parental mental load, from meal planning to coordinating after-school care, then see resources that help generate solutions.

Watch footage from the moments the Titanic wreck was discovered by a joint US-French research team in 1985.

Explore 3D models of some of the most dangerous viruses, allowing us to understand these and other pathogens in new ways.

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.

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.

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

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

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

Watch a breakdown of the canine family tree that explains how foxes and wolves are related to our beloved household pets, like poodles and dachshunds.

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

Abraham Lincoln had to sneak into Washington, DC, in disguise for his 1861 inauguration after a detective uncovered a plot to assassinate him in Baltimore.

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.

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

See a 3D reconstruction of Tenochtitlan, the Aztec capital

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

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

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

Peek into the love lives of thousands of strangers whom Stanford University researchers have been tracking since 2017 on this interactive page.

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

Explore the known asteroids, comets, and spacecraft involved in asteroid studies within our solar system with 'Eyes on Asteroids,' a 3D visualization from NASA.

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.

Explore a detailed map of Odysseus' fictional journey from 'The Odyssey.'

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

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

A dog's nose can be up to 100,000 times more sensitive than a human's, and each possesses a secondary organ for smelling, which helps learn about other dogs when they sniff each other's butts.

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

This interactive website features nearly 40,000 photos from Wikipedia for you to create visual mosaics with.

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

Light takes approximately eight minutes to travel from the sun's surface to Earth, but it takes thousands of years to reach the star's surface from its core—a distance more than 200 times shorter.

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

'Tulip mania,' the 1630s Dutch craze where rare bulbs were briefly traded like luxury assets, may have been the first financial bubble—and it still shapes markets today.

The average banana produces one positron—the antimatter counterpart to an electron—every 75 minutes as its trace amounts of radioactive potassium decay.

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.'

Explore the history, structure, and species of Australia's Great Barrier Reef with this interactive journey narrated by Sir David Attenborough.

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

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

Watch an animated visualization of how the Large Hadron Collider works, including how particles are accelerated through a series of machines and how collision data is collected and distributed worldwide.