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The adult human body is up to 60 percent water

Up to 60 percent of the adult human body is water.

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The share varies by organ. The brain and heart are about 73 percent water, the lungs about 83 percent, and the skin 64 percent.

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Open U.S. Geological Survey

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The ocean is blue because water absorbs red light

The ocean is blue because water absorbs colors in the red part of the light spectrum and leaves the blue.

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A second is defined by cesium atoms

Atomic clocks count 9,192,631,770 microwave oscillations of cesium atoms and call that interval one second.

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Tectonic plates move as fast as fingernails grow

Earth's tectonic plates move at roughly the same rate that your fingernails grow.

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