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 human skeleton is made of 206 bones that provide structure, protect organs like the brain and heart, and work with muscles and joints to enable movement. Bones also store minerals and produce blood cells in their marrow.
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