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Explainers in Science
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Why the sky is blue
The sky is blue because air scatters blue light about six times more than red. See why sunsets turn red and…
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Rainbows
A rainbow is sunlight bent and bounced inside raindrops. See why it is an arc, why red is on the outside, and…
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Why the sea is salty
The sea is salty because rivers carry dissolved minerals from rock into it and evaporation leaves them…
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How tides work
Tides come from the Moon's gravity pulling on the sea. See why there are two high tides a day, why each comes…
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Why ice floats
Ice floats because water expands as it freezes, making ice about 8% less dense than liquid water. See why…
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How soap works
Soap molecules have a water-loving end and a grease-loving end, so they can lift oil and dirt into water. See…
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Sound
Sound is a vibration that travels through air as a wave. See what pitch and volume mean, why echoes happen…
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Gravity
Gravity is a pull between anything with mass. See why things fall, why orbits are falling sideways, and why…