xkcd continues to answer the important questions.…
sky
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What if you floated upwards one foot every second
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History of the sky
Ken Murphy installed a camera on top of the Exploratorium in San Francisco…
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Average color of NYC skies, every five minutes
The color of the sky changes through the day and into the night…



Visualize This: The FlowingData Guide to Design, Visualization, and Statistics (2nd Edition)
