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In both sexes, a rise in growth hormone produces the adolescent growth spurt, the pronounced increase in height and weight that marks the first half of puberty.

Perhaps the most dramatic changes of puberty involve sexuality.

When Li was 12 years old, he quit school and started working as an apprentice in a factory which manufactured watch straps.

But, he had to borrow funds from his friends and family and contacts.

Later he decided to supply quality plastic flowers to the world at extremely low prices.

Internally, through the development of primary sexual characteristics, adolescents become capable of sexual reproduction.

Externally, as secondary sexual characteristics appear, girls and boys begin to look like mature women and men.

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