The same discriminatory thinking lies behind the continuing gender gap in pay and why there are still so few women in office in the West. The root of this prejudice lies deep in our histories, but its impact is felt every day. It is not women and girls alone who suffer. It damages all of us. The evidence shows that investing in women and girls delivers major benefits for society. An educated woman has healthier children. She is more likely to send them to school. She earns more and invests what she earns in her family.