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Best water bottles 2023: 13 of the best reusable bottles to keep you hydrated
By Ali Horsfall last updated
BUYING GUIDE Stay hydrated this summer with one of the best water bottles.

The worst droughts in US history
By Stephanie Pappas last updated
From the Middle Ages to today, North America has experienced a number of extremely dry periods.

Man sprouted thick, green 'fur' on his tongue in odd medical case
By Sascha Pare published
A man developed a condition known as hairy tongue, which can manifest itself in different colors depending on the bits of food, bacteria and dead skin cells that get trapped in the "hairs."

Bright green laser lines shoot across night sky in Hawaii. What caused them?
By Harry Baker published
A series of laser flashes recently lit up the night sky above Mauna Kea in Hawaii. Experts say the lasers were emitted by a NASA spacecraft.

What are the effects of global warming?
By Alina Bradford, Stephanie Pappas last updated
Reference The effects of global warming will be far-reaching and often devastating, scientists have warned.

Blue Bananas Surprise Scientists
By Andrea Thompson last updated
Products of chlorophyll breakdown make ripening bananas glow blue under black lights.

What Is Coral Bleaching?
By Donavyn Coffey last updated
Nature's red flag is the eerie white glow of one of the ocean's most biologically rich ecosystems.

Earth Will Survive Global Warming, But Will We?
By Ker Than last updated
The planet has endured far more dramatic climate change in the past fueled by other forms of life. But rarely if ever has the change been so rapid.
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