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

Profound Changes Underway in Earth's Oceans and Ice, Says IPCC Climate Report

Profound Changes Underway in Earth's Oceans and Ice, Says IPCC Climate Report
The Tallest Mountain in the Solar System Is Much Higher Than Everest

The Tallest Mountain in the Solar System Is Much Higher Than Everest
Can Bionic Reading Make You Read Faster?

Can Bionic Reading Make You Read Faster?
COP26 Methane Pledge Could Have Fastest Impact on Earth's Climate

COP26 Methane Pledge Could Have Fastest Impact on Earth's Climate

Entertainment

Is Bugs Bunny a Rabbit or a Hare?

Is Bugs Bunny a Rabbit or a Hare?
Mamma Mia! The ABBA Quiz

Mamma Mia! The ABBA Quiz
How Chess Works

How Chess Works
What Are the World's Biggest and Baddest Jigsaw Puzzles?

What Are the World's Biggest and Baddest Jigsaw Puzzles?

Auto

How Superchargers Work

How Superchargers Work
The Dirty Truth About How Often You Need Your Oil Changed

The Dirty Truth About How Often You Need Your Oil Changed
The Car Cupholder Craze Is Out of Control

The Car Cupholder Craze Is Out of Control
Rivian Aims to Change the EV Industry One Pickup at a Time

Rivian Aims to Change the EV Industry One Pickup at a Time

Home & Garden

Perlite: It's Like Popcorn for Your Potting Soil!

Perlite: It's Like Popcorn for Your Potting Soil!
Do Pool Pumps Have to Run All the Time?

Do Pool Pumps Have to Run All the Time?
How the Adirondack Chair Became the Comfiest One You Can Own

How the Adirondack Chair Became the Comfiest One You Can Own
6 of the Biggest Houses in the World

6 of the Biggest Houses in the World

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