The rationale for twin studies is that twins do not normally develop under similar environments.

just add on too that

explanation:

each year on march 8, international women’s day is celebrated around the globe. it’s an important opportunity to shine a spotlight on women’s involvement, contributions, and accomplishments on a range of issues from domestic violence to the role of women in the c-suite. the theme this year is “be bold for change”― a dictum that those who know me personally will acknowledge has pretty much been my mantra throughout my career on wall street, in media and most recently, in philanthropy.the empowerment of girls as leaders, who can be emboldened today to become even stronger leaders tomorrow, is an increasingly recognized imperative in our world, and it couldn’t be closer to my heart