7B+Sex+and+Science

__**Sex and science**__

__**A good video:**__ http://www.cornel1801.com/bbc/HUMAN-BODY/An-Everyday-Miracle-movie-film.html

[|http://www.corbisimages.com/Search#q=sperm]

Changes that happen after birth: http://www.nlm.nih.gov/medlineplus/ency/article/002395.htm