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

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.

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.

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.

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.

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.

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

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

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

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

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

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.

Explore the wineries of Napa Valley with an interactive map of its hundreds of wineries, vineyards, and tasting rooms.

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.

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.

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

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

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

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.

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.

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

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

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.

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.

Computer scientists first started trying to optimize dating using computers in the 1950s.

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.

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

Apeirophobia is the fear of everlasting life and may stem from the human brain's inability to conceptualize the concept of anything happening beyond what it can project out, such as the concept of an infinite life.

'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.

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.

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

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

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

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.

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

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.

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

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

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.

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.