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Water is the only substance that expands when it freezes

Frozen water expands 9%, cracking pipes and splitting rocks—but it also makes ice float, keeping fish alive.

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Water.Day_women with glass of alcohol
Your hangover is literally water debt collection

That headache is your brain shrinking slightly from dehydration, demanding you pay back the water alcohol stole.

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Water.Day_shower in nature in the middle of nowhere
Cold showers cut sick days by 29%

A 2025 PLOS ONE analysis of 3,177 people confirmed that regular cold shower exposure reduces workplace sickness absence by nearly one-third.

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Water.Day_woman with blue sky umbrella
The prediction advantage

Scientists can predict El Niño and La Niña several months to a year in advance using modern climate models.