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Director / Editor: Victor Teboul, Ph.D.
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Independent and neutral with regard to all political and religious orientations, Tolerance.ca® aims to promote awareness of the major democratic principles on which tolerance is based.

The sky isn't just blue – airglow makes it green, yellow and red too

By Michael J. I. Brown, Associate Professor in Astronomy, Monash University
Matthew Kenworthy, Associate professor in Astronomy, Leiden University
The sky looks blue on a sunny day – but at night we can see the faint glow of its true colour.The Conversation


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