Ice cubes floating in a glass of water, showing why ice floats due to lower density

Why Ice Floats but Rocks Don't

Learn why ice floats and most solids sink. See how hydrogen bonds lower ice density and why this quirk helps life on Earth survive winter.
Gold “60” balloons on a black background, illustrating a round-number milestone.
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Hands typing in a busy iMessage group chat on a smartphone
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Car GPS navigation screen at night
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Synchronized fireflies glowing yellow-green in a dark forest at night
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Vocalist recording in a studio with microphone and lyric sheet
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Sleeping man on comfy bed, illustrating why we dream about strangers
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Two friends complaining at a kitchen table, illustrating the science of venting and negativity.
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Woman wearing headphones outdoors, experiencing frisson and showing why sounds give you chills.
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Close-up of a hand writing notes with a pen on white paper.
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