03:35 min
CLEAR ALL
More than 1,000 former NFL players are addicted to painkillers. Many are without health insurance, or any semblance of a support system.
Biological anthropologist Helen Fisher walks us through the biology of love. From the importance of one-night stands to the solidity of marriage, Fisher shreds the common wisdom of what love is and isn't in the 21st century.
Learn about the evolution and future of human sex, love, marriage, gender differences in the brain and how your personality type shapes who you are and who you love.