The Body's Tiny Defense System
When a sniffle strikes, two curious kids shrink down to meet the body's tiny defenders—white blood cells, antibodies, and more—as they discover how the immune system spots germs and fights them off.
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🔬 Science Element
The nervous system is the body's communication network. Sensory nerves carry messages from the skin and other organs to the brain and spinal cord; motor nerves send commands back to muscles. This rapid signal travel lets you react to the world in milliseconds.
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