donnieporko

 Research by Karli N. Johonnot  Fluidity in Women’s Sexuality from Duke University, point out, the factor is 

Psychological Influences

Biological Influences

Social Influences

Hope that helps.

One of my favourites is Electrospray Ionization Mass Spectrometry

The success of the study of gas-phase ion chemistry and its application has been driven by the continuous advancement of the mass spectrometric technique since the studies were performed by Thomson

I will be soon, so follow up to get more wonderful advice. thanks 

interesting questions, thanks for you all detail reply, I learned a lot 

thanks for @swansont's reply