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A U.S. Air Force plane spraying Agent Orange over Vietnam, May, 1970
Understanding Agent Orange: History, Impacts, and Environmental Justice
Franklinia alatamaha
10 Historic Plants and Why They Went Extinct
Queen Elizabeth
Queen's Speech at COP26 Calls on Leaders to Strive for 'True Statesmanship'
Bits of sky show through a canopy of green trees in a forest.
What Is Deep Ecology? Philosophy, Principles, and Criticism
Rows of combines harvest soybeans at a farm in Mato Grosso, Brazil with green fields on the periphery.
Green Revolution: History, Technologies, and Impact
This Strange Tricycle Was Patented In 1881
A Solar motor built by Aubrey Eneas in Pasadena, California.
Who Invented Solar Panels? Discover the History of Solar Energy
Activists demonstrating against global warming
The History of Environmental Justice in the United States
Diplocaulus, extinct amphibian from the Late Carboniferous to Permian period
What Caused the Permian Extinction?
How the Navajo Code Talkers Helped Win World War II
Why Are Some Countries 30 Minutes Off the Global Time Zone Grid?
Illustration of Sir Isaac Newton contemplating a fallen apple
5 Brilliant Mathematicians and Their Impact on the Modern World
Flower shop
The Language of Flowers and Herbs: 71 Plants and Their Meanings
8 of the World's Most Dangerous Daredevil Stunts
9 Things You Don't Know About John Muir
​'The Real Dirt on America's Frontier Legends'
12 Things You May Not Know About Otzi the Iceman
Cesar Chavez
11 Things You May Not Know About Cesar Chavez
10 Famous Appalachian Trail Hikers
Fisherman pulling an old bottle from fishing net
12 Amazing Message-In-A-Bottle Stories
Vera Rubin and NASA Sponsors Women Conference
10 Female Astronomers Everyone Should Know
Theodore's Cabin at Roosevelt Theodore National Park
6 Eco-Friendly Presidents
10 of the World's Biggest Unsolved Mysteries
9 Famous Female Aviators
Where Did the Word 'OK' Come From?
Did You Hear About the Eggnog Riot of 1826?
The Lost Towns Under Lake Murray
Overhead aerial view of winding mountain road inside colorful autumn forest
Why Does Autumn Have Two Names?
silver spider christmas ornament nestled in green Ukrainian tree
The Story Behind Spider Christmas Ornaments
forest floor filled with green ferns and bottoms of tree trunks
8 of the Oldest Forests in the World
Mayan ruins against blue sky in Tulum, Mexico
8 Ancient Environmental Disasters Caused by Humans
9 Trailblazing Female Explorers
Prince's palace of Monaco
10 Countries Where Royalty Still Rules
fruits and veggies laying on the ground
7 Fruits and Veggies That Used to Look a Whole Lot Different Than They Do Today
How Wheat Changed the World
10 Streets That Helped Shape America
Do We Still Need Daylight Saving Time?
The entrance to Bell Witch Cave
The Spooky History of Bell Witch Cave
6 Great Treasures Found With a Metal Detector
Looking down the middle of two rows of apple trees in an orchard
10 Things You Didn't Know About Johnny Appleseed
Teddy Roosevelt's White House Was a Real Zoo
Tipis: Everything You Ever Wanted to Know but Were Afraid to Ask
Mexico City at night during Christmas with giant lit piñata
11 Christmas Traditions We Don't Have in the U.S.
11 Cultural Traditions Protected by UNESCO
15 Legendary World's Fair Leftovers
bridal bouquet
The Strange and Surprising History Behind 13 Popular Wedding Traditions
Is It Time to Say Goodbye to the Circus?
9 of the World's Most Multilingual Countries
12 Famous Horses From History
Cain and Abel Mystery Solved?
An antique barn in a meadow of tall, green grass
12 Time-Rewinding Living History Farms
This African-American Female Scientist Helped Launch the Space Race
6 Ancient Recipes Translated for Modern Cooks
10 Ways Animals Have Served the Military
7 Cultural Concepts We Don't Have in the U.S.
1941 photo showing plane mechanics and the future of plane travel with TWA plane
What the Future Looked Like Way Back When
MLK civil rights march
10 Surprising Things You May Not Know About Martin Luther King Jr.
8 Languages on the Verge of Extinction
10 Accidental Inventions That Changed the World