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A Smoke Cell demonstrating Brownian Motion in Air.
Автор: FranklyChemistry
Загружено: 2013-02-06
Просмотров: 100109
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We can't see the particles of air, but we can see what they are doing.
We can't see the wind - but looking out the window we can see what it is doing.
Who has seen the wind?
Neither I nor you:
But when the leaves hang trembling,
The wind is passing through.
Who has seen the wind?
Neither you nor I:
But when the trees bow down their heads,
The wind is passing by.
By Christina Rossetti 1830--1894 Christina Rossetti
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