aqpandab:
But why books/paper rather than sunblock? It's true of course that UV will have an effect on the skin, but Vitamin D is vital - a google search brought up this study:
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1584409
"Conclusion
The survey revealed considerable ignorance and confusion about the role of sunlight in vitamin D production, and the function and sources of vitamin D. Attitudes and behaviour toward sunlight were largely negative and many took measures to avoid sunlight, particularly among younger (middle-aged) women who had good awareness of vitamin D."
So, if I can extend the question, could someone who knows give some account for this cultural relation to sunlight?
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