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Mental Floss

WATER

Liquid gold.

Why Is Bottled Water So Expensive?

We pay billions for something that comes out of a faucet for pennies. Here’s why.

Jake Rossen

'Nature's Pitfall' by Samantha Stephens.

See 11 Stunning Images From the 4th Annual Close-Up Photographer of the Year Competition

Slime mold definitely had a moment—but it’s hard to beat two dead salamanders floating in a carnivorous plant.

Ellen Gutoskey

Dubai Has Built the World’s Deepest Pool
Icon / VideoCreated with Sketch.

A Dive in the World’s Deepest Indoor Pool Is Not for the Faint of Heart

Deep Dive Dubai plunges 197 feet beneath ground level and holds 14 million liters of water.

Michele Debczak



Which of these water types is better? We have an answer.

What’s the Difference Between Hard and Soft Water?

“It just tastes funny” is only part of the difference between hard water vs. soft water.

Jake Rossen


An electricity-less San Juan, Puerto Rico, post–Hurricane Fiona.

5 Organizations Helping Victims of Hurricane Fiona in Puerto Rico

Just five years after Hurricane Maria, Puerto Rico is again largely without power or clean water. Here’s how to help.

Ellen Gutoskey


Get out on the water without making a splash.

Start Your Summer Off Right by Saving $300 on This Bestselling Inflatable Stand-up Paddle Board

Through Amazon, you can now save up to $300 on the bestselling SereneLife inflatable stand-up paddle board.

Elaine Selna


Anyone thirsty for some refreshing river water?

Traveling Soon? Take these LifeStraw Products With You to Get Clean Drinking Water From Anywhere

The LifeStraw water bottle and personal water filter are some of the best drinking tools to have with you while camping or hiking, and now you can get them on Amazon.

Elaine Selna
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