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One well fills many pots in a village. Illness can travel by the same water.

This is Chapter 3, Health: The Ultimate Treasure.

What this track covers

• More than not being ill — physical, mental and social health.
• How an illness spreads — air, water, food and touch, each a chain.
• Insects that carry germs — a vector, and the still water it needs.
• The body's own defences — barriers outside, the immune system inside.
• The second time — a body fights a known germ sooner.
• A vaccine — trains the body before the germ arrives.
• Cutting the route — everyday steps cut links, and order matters.
• Two kinds of illness — some spread between people, some do not.
• Felt or measured — symptoms are felt, signs are seen or measured.
• What an antibiotic does — it works against bacteria, not viruses.
• Resistant germs — bacteria can stop responding to an antibiotic.

One rule before anything else

A bench is a screen where you test an idea. Every bench here is made up. Nothing here is about you. A real worry goes to a parent, a teacher or a doctor.