In nearly all cultures, countries, and nations' females have been considered to be of less value than males. These trends of gender bias start early in life and produce lasting effects. Early in life, children are presented with the prescribed options for their role in society. Young girls are often given baby dolls, dress-up clothes, and tea sets to play with. This helps them learn to care for others, to make them appear beautiful, and how to cook. Boys, on the other hand, are given Lego building blocks, sporting equipment, and science sets from which they learn critical thinking skills, gross motor skills, and mathematical knowledge.