How Often Should You Replace Your Toothbrush?

How Often Should You Replace Your Toothbrush?

Our Top Reads

10 of the World's Ugliest Animals: So Homely They're Cute

March 2 By Jesslyn Shields

How Old Was Jesus When He Died?

March 2 By Dave Roos

How 'Lasagna Gardening' Helps Create Healthy Soil

March 2 By Kate Morgan

How the CPR Doll Developed From a Famous Parisian Death Mask

How the CPR Doll Developed From a Famous Parisian Death Mask
How to Fold a Fitted Sheet

How to Fold a Fitted Sheet
19 Dog Breeds That Don't Shed

19 Dog Breeds That Don't Shed
What Are the World's Highest Mountains, After Everest?

What Are the World's Highest Mountains, After Everest?

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

How Having an Imagination Sets Us Apart and Makes Us Human

Feb. 28 By Andrey Vyshedskiy

Snakes Can Hear You Scream, New Study Says

Feb. 17 By Christina N. Zdenek

How Dangerous Was the Ohio Chemical Train Derailment?

Feb. 16 By Andrew J. Whelton

Why Does Jupiter Have 92 Moons When Earth Just Has One?

Feb. 15 By Mark Mancini

Remembering Bayard Rustin, Civil Rights Leader and Gay Activist

Feb. 1 By Jerald Podair

Even Advanced AI Can't Solve All Problems

Jan. 31 By Jie Wang

Worm, Harvest, Blue: Every Full Moon Has a Name

Worm, Harvest, Blue: Every Full Moon Has a Name
Doomsday Clock Now Closest It's Ever Been to Midnight

Doomsday Clock Now Closest It's Ever Been to Midnight

Did You Hear?

10 Things You Should Know About Rachel Carson

10 Things You Should Know About Rachel Carson
What's the Difference Between 'Affect' and 'Effect'?

What's the Difference Between 'Affect' and 'Effect'?
7 of the Hottest Peppers in the World

7 of the Hottest Peppers in the World
Room Soundproofing Tips

Room Soundproofing Tips
The Bizarre Link Between van Gogh's Signature Yellow and Cow Urine

The Bizarre Link Between van Gogh's Signature Yellow and Cow Urine

Science

Centrioles: You Can't Divide Cells Without Them

Centrioles: You Can't Divide Cells Without Them
Robotic Drones Can Now Fly, Stop and Perch Just Like Birds

Robotic Drones Can Now Fly, Stop and Perch Just Like Birds
How Helicopters Work

How Helicopters Work
5 of Earth's Highest Deserts

5 of Earth's Highest Deserts

Entertainment

How to Play Slot Machines

How to Play Slot Machines
Marvel's 'Wakanda Forever' Pays Homage to Mesoamerican Cultures

Marvel's 'Wakanda Forever' Pays Homage to Mesoamerican Cultures
6 Famous Paintings That Hold Hidden Messages

6 Famous Paintings That Hold Hidden Messages
Sticks, Stones and Knucklebones: The History of Dice

Sticks, Stones and Knucklebones: The History of Dice

Auto

Is It Bad if Your Brake Pedal Goes to the Floor?

Is It Bad if Your Brake Pedal Goes to the Floor?
Car Safety Systems Don't Always 'See' in Bad Weather, AAA Says

Car Safety Systems Don't Always 'See' in Bad Weather, AAA Says
Top 10 Signs of Transmission Trouble

Top 10 Signs of Transmission Trouble
Drivers Who Merge at the Last Minute May Be Annoying, But They're Right

Drivers Who Merge at the Last Minute May Be Annoying, But They're Right

Home & Garden

How to Clean a Keurig

How to Clean a Keurig
Closing Your Bedroom Door at Night Could Save Your Life

Closing Your Bedroom Door at Night Could Save Your Life
Getting to the Bottom of the Bidet

Getting to the Bottom of the Bidet
Bee Balm: If You Plant It, They Will Come

Bee Balm: If You Plant It, They Will Come

Editor's Picks

How Wild Animals Survive Freezing Temperatures

How Wild Animals Survive Freezing Temperatures
You Don't Want to Know How Maraschino Cherries Are Made

You Don't Want to Know How Maraschino Cherries Are Made
National Bubble Wrap Day? Who Is Making Up These Weird Holidays?

National Bubble Wrap Day? Who Is Making Up These Weird Holidays?

Aliens and UFOs

Scientists Want You to Say 'UAPs', Not 'UFOs'

Scientists Want You to Say 'UAPs', Not 'UFOs'
Does the Real Element 115 Have a Connection With UFOs?

Does the Real Element 115 Have a Connection With UFOs?
How Area 51 Works

How Area 51 Works

Celebrating Creative Visionaries

Christo Was His Name, Wrapping Was His Game

Christo Was His Name, Wrapping Was His Game
Michael Heizer's Magnum Opus, 'City,' Opens After 50 Years

Michael Heizer's Magnum Opus, 'City,' Opens After 50 Years
Opus 40: Harvey Fite's Bluestone Sculpture Park in Upstate NY

Opus 40: Harvey Fite's Bluestone Sculpture Park in Upstate NY

Eggsellent!

How to Tell If Eggs Are Bad

How to Tell If Eggs Are Bad
White, Brown, Green Chicken Eggs: What's the Difference?

White, Brown, Green Chicken Eggs: What's the Difference?
Eggs Are Expensive! Here's How to Freeze Them

Eggs Are Expensive! Here's How to Freeze Them