A Rare Surviving Letter From Martha Washington Sheds Light on Her Young Daughter's Struggle With Epilepsy

The Handwritten Final Draft of Martin Luther King Jr.'s 'I Have a Dream' Speech Was Considered Lost. It Turned Out to Be Sitting in a Desk Drawer for Decades

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Octopuses Are the Ultimate Escape Artists. Now Scientists Know How the Creatures Contort Themselves to Squeeze Through Tiny Holes

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Dismantled to Survive the Nazi Blitz, Coventry Cathedral's Stained Glass Is 'a Medieval Jigsaw Puzzle.' Its 12,000 Fragments Are Now Digitized for Public View

This Adorable, Orphaned Baby Walrus Was Rescued by Two Researchers in Alaska. Now, He's Found a New Home in Florida

How Do Pandas Have Sex While in Human Care? As the National Zoo’s Director Details in Her New Book, It Takes a Village of Dedicated Keepers

Voyager 1 Is the Farthest Human-Made Object in the Universe—and the Spacecraft Is About to Reach One Light-Day From Earth

The Maya Loved Using Mercury-Rich Red Paint to Decorate Pottery, Temple Walls and Even Burials. They May Have Accidentally Poisoned Their Own Water and Food Supply in the Process

While Cleaning Out Her Aunt's Manhattan Apartment, a Woman Found a Long-Lost Georgia O'Keeffe Painting Buried Beneath Fur Coats in the Closet

Neolithic Cannibalism Wasn't an Act of Desperation. Almost 1,000 Skeletal Fragments From Caves in Southern Spain Show How Eating Human Flesh Was a Continual Practice

The Great Pacific Garbage Patch Has Accumulated So Many Microplastics They Might Be Changing the Color of the Ocean

Humans May Have Been Getting High on Weed 2,800 Years Ago. Cannabis Seeds and Hair With Traces of THC Were Found in an Ancient Tomb

Even Replacing Some of Your Dietary Dairy With Plant-Based Alternatives Can Lead to Nutrient Deficiencies, Study Suggests

This African Prophet Was Burned at the Stake 320 Years Ago. Today, Kimpa Vita Is Celebrated as the 'Kongolese Joan of Arc'

The Panama Canal Has an Unusual Ecosystem, Flowing From Fresh Water to Salt Water and Serving as a Home to Crocodiles, Manatees and Sea Squirts. New Intruders Pose a Growing Threat to the Waterway

Where Did Stonehenge's Mysterious, Six-Ton Altar Stone Really Come From? Geologists Rule Out the Scottish Hypothesis as the Search Deepens

Stolen During the Nazi Occupation of Orléans, France, This Painting Was Rediscovered After 86 Years With Help From Wild West-Inspired 'Wanted' Posters

This Wooden Wardrobe in Pompeii Remained Sealed for Nearly 2,000 Years. Archaeologists Just Opened It for the First Time

For Centuries, Cave Visitors Walked Right by 280 Ice Age Engravings. The Newly Discovered Rock Art Is Rewriting Catalonia's Prehistory

CARE Packages Provided a Lifeline for World War II Survivors. Here’s How the Group Turned Leftover Army Rations Into an 80-Year Legacy

Strange Gas in Mars' Atmosphere Hints the Red Planet Is Still Volcanically Active—and Points to Places to Search for Alien Life

These Moths Use Their Genitals to Fend Off Bats—but Not in the Way You Think. They Emit Ultrasound to Scramble the Predators' Sonar

The Arctic Polar Vortex Is Collapsing Earlier in the Season Than Ever Documented—but We Don't Know How It'll Affect Global Weather

Michelangelo Used These Custom, Multi-Headed Brushes While Painting 'The Last Judgment' to Replicate His Intricate Sculpting Techniques

The Real Story Behind the 504 Sit-In for Disability Rights, the Longest Peaceful Occupation of a Federal Building in American History

Fossil Footprints in Brazil Hint at a Cougar-Size Mammal That Walked Among Dinosaurs. It's Another Sign That Some Early Beasts Grew to Impressive Sizes After All

Hear, Hear to Long Ears: These 15 Furry Photos of Adorable Rabbits and Hares Will Have You Leaping for Leporidae

A Nazi Submarine Torpedoed a Merchant Ship Just Off the Coast of Maine in 1944. Divers Have Finally Located the Wreckage, 400 Feet Below the Surface

Was the British King Who Urged the Romans to Invade Actually a Queen? One Archaeologist Thinks So

China Announces a Plan to Put Astronauts on the Moon by 2030, Revealing Details of Four Upcoming Missions

This Bull and Male Donkey Have a Surprisingly Sexual Relationship, Providing Insights Into Interspecies and Same-Sex Bonds

America's Newest UNESCO World Heritage Site Is a Swamp—and That's Exactly Why You Should Go

This Ancient 'Hell Chicken' Might Be the First Known Fruit-Loving Dinosaur, Revealing a Whole New Cretaceous Lifestyle

Archaeologists Found a 3,300-Year-Old Sword at the Bottom of a Volcanic Lake in Italy—and It's Still Sharp

It's Not Just You: Some Fast-Flying Birds Also Get Jet Lag

Actually, You Can Go Back to Constantinople. A Landmark Exhibition Reconstructs the Imperial City With 1,600 Years of Treasures From Byzantine and Ottoman Times

Faded Over Millennia, the Intricately Carved Sandstone Walls of This Ancient Egyptian Shrine Will See Color Once Again

New York Had Its First Measles Death in 30 Years. Here's What to Know

Scientists Say They've Found Preserved Dinosaur Blood in a 115-Million-Year-Old Fossil, but Not Everyone Is Convinced

Forensic Analysis of Frozen Inca Mummies Reveals That Sacrificed Children Were Plied With Coca Leaves, Corn Beer and Ayahuasca Compounds Before Death

The Four-Color Theorem Has Haunted Mathematicians for Decades. It Just Got a Rare New Proof, but Some Still Long for a Simpler Solution

See the World's Tallest Day of the Dead Skeleton, Made From Steel, Fiberglass, Papier-Mâché and 70,000 Marigolds

Archaeologists in Scotland Discovered the Skeleton of a Roman-Era Man Who Was Decapitated Nearly 2,000 Years Ago. Now, You Can See What He Might Have Looked Like During His Lifetime

See a Stunning Simulation of the Early Universe, Which Will Help Astronomers Shed Light on the Cosmic Dark Ages

Native Hawaiians Descend From a Group of 'Ultravoyagers' Who Sailed About 4,400 Miles From Easter Island, Genetic Study Suggests

A 'Poor Man’s Rembrandt' for a Few Hundred Bucks? At Amsterdam's Rembrandt House Museum, a Pop-Up Tattoo Studio Is Inking 17th-Century Masterpieces on Human Canvases

After Observing the Sky for 22 Years, a Beloved NASA Space Telescope Is Expected to Meet a Fiery Death This Week

From Hunting Hounds to Modernist Muses, Dachshunds Have Done It All. See the World's First Art Exhibition Dedicated Exclusively to the Sausage Dog

Greece Has Its Own Pompeii, and the Ruins Tell a Captivating Story of a Sophisticated, Seafaring Bronze Age Society

Engineers Delicately Removed the Masts From This Bomb-Laden World War II Shipwreck in the River Thames. But 1,500 Tons of Explosives Are Still in Place