United States Cancer Statistics:  What are the top 10 cancers for men and women in the United States?  Find out here: http://apps.nccd.cdc.gov/uscs/

 More interesting facts about sperm banks: 
http://health.howstuffworks.com/pregnancy-and-parenting/pregnancy/fertility/sperm-bank.htm

How and where do cancers spread?
http://www.cancer.gov/cancertopics/factsheet/Sites-Types/metastatic