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When gravity nearly disappears
On the ISS, surface tension pulls liquid into the smallest shape. Boiling generates bubbles 30x faster than on Earth.
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Your tears have the same salt level as the ocean
Human tears contain about 0.9% salt - nearly identical to seawater, like your body remembers where life began.
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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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Drinking cold water burns more calories than warm
Your body uses energy to heat cold water to body temperature, burning about 8 extra calories per glass.