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Why is it Dark at Night ?

The answer is not so simple ..... but interesting

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Added: Oct-2-2012 
By: Aussie
In: Other Entertainment, Science and Technology, Nature, Other
Tags: Why, is, it, Dark, at, Night,
Marked as: approved
Views: 1491 | Comments: 45 | Votes: 12 | Favorites: 11 | Shared: 0 | Updates: 0 | Times used in channels: 2
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