Perché gli uomini hanno i capezzoli?

Come mai gli uomini nascono coi capezzoli come le donne anche se, solitamente, a loro non servono?

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Fonti:
- Male Breast Cancer: http://www.nationalbreastcancer.org/male-breast-cancer
- Why do men have nipples? http://www.nature.com/news/1999/990805/full/news990805-1.html
Approfondimenti:
- why do men have nipples: https://www.scientificamerican.com/article/why-do-men-have-nipples/
- Breast Cancer in Men, key statistics:
http://www.cancer.org/cancer/breastcancerinmen/detailedguide/breast-cancer-in-men-key-statistics
-The Risk Factors for Male Breast Cancer: http://www.breastcancer.org/symptoms/types/male_bc/risk
- Rats nipples: http://biology.stackexchange.com/questions/34150/evolutionarily-why-do-male-rats-and-horses-lack-nipples
- Rats nipples #2: http://www.nature.com/news/1999/990805/full/news990805-1.html
Audio Credits:
- Nighttime Stroll
- Rob Gasser & Laura Brehm - Vertigo [NCS Release]

Видео Perché gli uomini hanno i capezzoli? канала Science4Fun