Girls' bodies undergo gradual changes during puberty, analogous to but distinct from those experienced by boys. Puberty is the process of physical changes by which a child's body matures into an adult body capable of sexual reproduction to enable fertilisation . It is initiated by hormonal signals from the brain to the gonads -either the ovaries or the testes . In response to the signals, the gonads produce hormones that stimulate libido and the growth, function, and transformation of the brain, bones , muscle , blood , skin , hair , breasts, and sexual organs. Physical growth —height and weight—accelerates in the first half of puberty and is completed when the child has developed an adult body. Until the maturation of their reproductive capabilities, the pre-pubertal, physical differences between boys and girls are the genitalia , the penis and the vagina. Puberty is a process that usually takes place between the ages 10–16, but these ages differ from girl to girl. The major landmark of girls' puberty is menarche, the onset of menstruation, which occurs on average between ages 12–13.    
Tommy recalled arriving at their house of horrors. ‘The very first thing [Hindley] did when she brought the slice of bread and jam out... It was the way she put it onto the table. It wasn’t placed on the table. It was dropped. The first thought when I looked at the bread and jam was - I know this sounds really strange - there was no margarine on it.’ Tommy quickly noticed a change in [Hindley’s] behaviour too, from the woman with the ‘perfume’ and ‘kind eyes’ he’d met in the park, to someone he knew he wanted to get away from. ‘I looked up at her and noticed that there was a complete change in her altogether.’
In recent decades, women have clearly expanded their footprint in the managerial ranks of corporate America. According to data from the . Bureau of Labor Statistics, in 1980, only 7% of women were working in managerial and administrative occupations, compared with 17% of men. This gap has all but disappeared: 15% of women were in these occupations in 2012, compared with 17% of men. 10 Still, women have yet to come anywhere close to parity with men in the upper echelon of corporate America. According to the nonprofit research group Catalyst, women currently hold % of Fortune 500 CEO positions and % of Fortune 1000 CEO positions. 11 In the new Pew Research survey, respondents were asked to assess the level of focus men and women bring to their careers. Across age groups, majorities say that the men and women they know who are around their age are about equally focused on their careers. Among those who see a clear difference in focus between men and women, Millennials are the only ones who say women are more focused on their careers than men.