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  "body": "\n## Summary\n\nThe $n$-skeleton of a CW complex or of a simplicial complex is the part made of the cells or simplices of dimension at most $n$.\nThe skeleta form an increasing sequence of subcomplexes whose union is the whole complex.\nEach one is built from the previous one by attaching $n$-dimensional cells.\nInduction over the skeleta is the main technique for proving facts about CW complexes.\nThe $n$-skeleton already determines the homotopy groups of the complex below degree $n$.\n\n## Explanations\n\n### L1 human\n\nThink of a cube built in stages.\nFirst come its $8$ corners, the $0$-skeleton.\nThen the $12$ edges are added, giving a wire frame, the $1$-skeleton.\nThen the $6$ square faces are glued in, giving the hollow box, the $2$-skeleton.\nFinally, filling in the solid gives the whole cube.\n",
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