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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
Take a look at 7 fascinating things you might not know about one of the most extraordinary yet commonplace weather phenonmena.
Stratus clouds tend to be featureless, low altitude clouds that cover the sky in a blanket of white or grey.
Expert pharmacists at LloydsPharmacy talk us through the key differences.
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