"Why does facial hair grow faster in the summer?"
"Even though it seems like your hair should grow faster in the winter to keep you warm, your body thinks otherwise."
"Seasonal changes in human hair growth"
"Various parameters of hair growth were determined every 28 days for 18 months in 14 healthy Caucasian men aged 18-39 with indoor occupations in Sheffield, U. K."
"The Biology of Hair"
"Hair is much more complicated than it appears."
"Seasonal changes in metabolic and temperature responses to cold air in humans"
"The metabolic and temperature response to mild cold were investigated in summer and winter in a moderate oceanic climate."
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