An idea
Air and pressure
The ocean we live at the bottom of
Air is invisible, which makes it easy to think of as nothing. It is not nothing. It has weight, it pushes on you from every direction, and it is thick enough to hold up a cloud that weighs as much as a hundred elephants.
Change how hard it pushes and the world changes with it. Air carries sound, lifts water into the sky, makes a plane's ride bumpy, and gets squeezed hard enough by a falling speck of dust to glow.
The shape of it
Where it turns up
6 nights that touch this idea.
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Oxygen
Where every breath begins
About half of Earth's oxygen is made by plankton drifting in the sea, where nobody sees them.
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Airplane Turbulence
The sky's rockabye
Invisible hills and dips: moving air of different speeds meeting, and wings built to flex.
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Clouds
The shape water borrows
Droplets so small a million could fit in one raindrop, floating on air that is rising.
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Mariana Trench
The deepest place on Earth
The opposite extreme: water pressing down almost eleven kilometers deep, and still, life.
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Hearing
The science of sound waves
Sound is air pushed into ripples, which is why space is silent.
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Volcanoes
How the earth breathes
The Earth letting out a long warm breath, building new land as it goes.
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