CoachPuberty is the stage in which a child’s body becomes an adult’s — above all, an adult’s in Chapter 54’s sense: the reproductive organs mature and begin producing gametes, and the body takes on its adult form. It is the biological core of adolescence (Definition 15.1).
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Example 56.5 (One signal, many building sites)
The blood carries a hormone everywhere at once — which is why puberty is a coordinated rebuild: voice, shoulders and hair follow the same messenger, on one schedule, though the sites lie half a body apart. No nerve wiring connects a voice box to a beard; the bloodstream’s broadcast does (Chapter 61 makes this system a chapter of its own).
Example 56.8 (Questions have addresses)
Puberty raises questions — about timing, about bodies, about feelings — and they have proper addresses: school nurses and doctors answer them daily, confidentially and without surprise; trusted adults have all been through it; and this book’s chapters are built to be reread. What deserves no trust: playground legend and the internet’s worst corners, which trade on exactly this age’s uncertainties.