Most researches indicate brains of the girls matured at different speed of that of the boys. Besides, various functions of the brain ripe at different stages in the process of children's growth. For instance, girls can speak fluently earlier than boys so that they are more inclined to reading. Boys are apt for developing mechanical reasoning earlier and therefore have a crash on science at earlier age.
According to most research, the pace of brain maturing between girls and boys is different. Moreover, during the process of growing, different mechanism of brain matures at different stages. For example, the fluency in speaking for girls develops earlier than that for boys, so they are interested in reading earlier. The mechanical inference for boys tends to be more pre-mature than girls; hence, they are more in love with science at young ages.