Gender and Science

Reexamining the meaning of gender through cutting-edge science about the biology of humankind. A certain substance puts the sex of our bodies and brains in constant flux. Recent research has revealed that notions of there being a "male brain" or a "female brain" are mistaken.
In ages past, a typical woman menstruated about 50 times in her life -- in developed countries, the figure is 450 times, and menstruation causes an estimated 4.3 billion USD of lost productivity each year. Did menstruation develop as an advanced survival strategy for mothers and their babies? Evolutionary biology suggests the answer is yes. Can these new studies help lead us to a society where everyone can flourish, regardless of gender?