What Does a Catalytic Converter Do and Why Do People Steal Them?

What Does a Catalytic Converter Do and Why Do People Steal Them?

Our Top Reads

What Does HDMI Stand for? Here's How HDMI Works

March 14 By Marie Look, Tracy V. Wilson

7 of the 10 Hottest Countries in the World Are on 1 Continent

March 13 By Desiree Bowie

Who Were the Titanic Survivors?

March 13 By Marie Look

How Juliane Koepcke Survived the Crash of LANSA Flight 508

How Juliane Koepcke Survived the Crash of LANSA Flight 508
What's the Largest Pyramid in the World?

What's the Largest Pyramid in the World?
All About the Megalodon, Shark Giant of Prehistoric Times

All About the Megalodon, Shark Giant of Prehistoric Times
The Biggest Crab in the World, Plus 8 Enormous Contenders

The Biggest Crab in the World, Plus 8 Enormous Contenders

Try Our Crosswords, Riddles and Puzzles!

Can You Solve This Riddle?

Can You Solve This Riddle?
Play Our Crossword!

Play Our Crossword!
Can You Solve This Riddle?

Can You Solve This Riddle?

In the News

Yes, Conspiracy Theorists’ Brains Really Are Different

March 12 By Alia Hoyt

How the Ancient Land Blob Gondwana Became Today's Continents

March 12 By Jesslyn Shields

Three Famous Hypotheses and How They Were Tested

March 12 By Mark Mancini

7 Dazzling Details About the Louvre Pyramid

March 12 By Carrie Whitney, Ph.D.

'Rainbow Lightning': One of Mother Nature's Rare Shows

March 12 By Mark Mancini

Why Are Air-dried Towels So Stiff?

March 12 By Jesslyn Shields

Why Aren't Modern Suburbs Built on a Walkable Grid?

Why Aren't Modern Suburbs Built on a Walkable Grid?
What's the Difference Between Airspeed and Ground Speed?

What's the Difference Between Airspeed and Ground Speed?

Did You Hear?

The Fastest Fighter Jet in History: The NASA X-43

The Fastest Fighter Jet in History: The NASA X-43
The Yellow Deli Cult: All About the Twelve Tribes

The Yellow Deli Cult: All About the Twelve Tribes
How to Make a Bar Graph in Excel

How to Make a Bar Graph in Excel
Sampson, aka Mammoth: The Biggest Horse Ever

Sampson, aka Mammoth: The Biggest Horse Ever
Why Is Gas So Expensive at Certain Times of Year?

Why Is Gas So Expensive at Certain Times of Year?

Science

How the Scientific Method Works

How the Scientific Method Works
Why Flash Floods Are So Dangerous

Why Flash Floods Are So Dangerous
What Is Force? Learn About 4 Fundamental Forces of Nature

What Is Force? Learn About 4 Fundamental Forces of Nature
Are Doppelgangers Real? There's a 1 in a Trillion Chance

Are Doppelgangers Real? There's a 1 in a Trillion Chance

Culture

10 of the Oldest Continuously Inhabited Cities in the World

10 of the Oldest Continuously Inhabited Cities in the World
The French Resistance Took Many Forms During WWII

The French Resistance Took Many Forms During WWII
Still Riding the Rails: Life as a Modern Hobo

Still Riding the Rails: Life as a Modern Hobo
Kate Warne: First Female Pinkerton Detective Thwarted Lincoln Assassination Attempt

Kate Warne: First Female Pinkerton Detective Thwarted Lincoln Assassination Attempt

Animals

Why Does My Cat Lick Me?

Why Does My Cat Lick Me?
Ghostly White Squirrels Haunt a Town in Transylvania County, North Carolina

Ghostly White Squirrels Haunt a Town in Transylvania County, North Carolina
Why Does My Dog Lick Me?

Why Does My Dog Lick Me?
How a Frisky Feline Made Aviation History

How a Frisky Feline Made Aviation History

Auto

The Dirty Truth About How Often You Need Your Oil Changed

The Dirty Truth About How Often You Need Your Oil Changed
What Is a Clutch? Car Mechanics, Explained

What Is a Clutch? Car Mechanics, Explained
How Old Do You Need to Be to Rent a Car in the U.S.?

How Old Do You Need to Be to Rent a Car in the U.S.?
Windows Down or A/C on — Which Is More Fuel-efficient?

Windows Down or A/C on — Which Is More Fuel-efficient?

Editor's Picks

Why Is There a Crack in the Liberty Bell?

Why Is There a Crack in the Liberty Bell?
How American Exceptionalism Works

How American Exceptionalism Works
Black Loyalists Fought for Their Freedom During the American Revolution

Black Loyalists Fought for Their Freedom During the American Revolution

A River Runs Through It

The 9 Longest Rivers in the World: From the Nile to the Congo

The 9 Longest Rivers in the World: From the Nile to the Congo
Eco Engineers: 5 Animals That Can Reshape Earth's Waterways

Eco Engineers: 5 Animals That Can Reshape Earth's Waterways
River-bottom Bones: The Strange World of Underwater Fossil Hunting

River-bottom Bones: The Strange World of Underwater Fossil Hunting

Get Your Garden On

How 'Lasagna Gardening' Helps Create Healthy Soil

How 'Lasagna Gardening' Helps Create Healthy Soil
How Composting Works

How Composting Works
Companion Planting: The Do's and Don'ts of Growing Plants Together

Companion Planting: The Do's and Don'ts of Growing Plants Together

Deserts of the World

5 of Earth's Highest Deserts

5 of Earth's Highest Deserts
10 Largest Deserts in the World

10 Largest Deserts in the World
Hunting for Martians in the Most Extreme Desert on Earth

Hunting for Martians in the Most Extreme Desert on Earth