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

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

The Aztec Empire ruled over 80,000 square miles of central Mexico for nearly a century—until a small band of Spanish conquistadors brought it down in 1521.

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.

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

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

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

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

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

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

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

The animatronic shark from 'Jaws' was a complex machine called 'Bruce.'

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.

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.

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

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.

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

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.

As part of the up to 15 pounds of seafood they consume daily, sea otters eat urchins that feed on kelp forests—sources of shelter and food to over 800 species—thereby making the marine mammal a keystone species.

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

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.

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.

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

In 1962, the US detonated a nuclear weapon in space, which produced an electromagnetic pulse that disabled three low Earth orbit satellites and damaged electrical equipment in Hawaii.

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

Watch a visualization of what it would look like to move along Earth's surface as fast as the International Space Station, or about 23 times the speed of sound.

Joan Didion interviewed The Grateful Dead in 1967, before they became music icons.

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

George Lucas used Joseph Campbell's 'hero's journey,' a narrative structure that encompasses the common characteristics of multiple cultures' mythologies, to revise 'Star Wars.'

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

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.

Experience 14 billion years of important moments in world history with this scrollable interactive timeline.

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

Give your memories a place to live and explore the personal stories left by strangers, tied to specific locations, in this interactive map of the world.

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.

Rapid intensification is the increase in a hurricane's sustained wind speed by at least 35 miles per hour within 24 hours, which can strengthen it by up to two categories.

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.