Vitamin D

From Nov to Feb, there's not enough UVB in sunlight above latitude 42°N to make Vitamin D in the skin.



Via: http://informationisbeautiful.net
Data and research: http://bit.ly/42degreesN
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Alex E

Ecoclimax is defined by Odum (1969) as the culmination state after a succession in a stabilized ecosystem in which maximum biomass (or high information content) and symbiotic function among organisms is kept per unit of available energy flow.