Just when the snow is gone and the sun is warming things up, the black flies appear.

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This prevents the pope getting uncomfortably hot when the sun is shining but also ensures the glass doesn't steam up in high humidity.

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In the winter, when the sun is in the south, it shines on the entrance and heats things up in the summer, the sun moves to the north and the cave entrance is in the shade, keeping things inside cool.

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Her previous research had shown that, when the sun grows brighter, the ozone level rises too: it is up to 2% higher at solar maximum.

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Yet even when it does, the sun will come up in the morning and life will go on as if nothing is happening, such is the chronic way the world changes.

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Vitamin D researchers estimate that up to half of Americans might be getting inadequate amounts, especially in the winter months when the sun is low.

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