Why is it important that the skin on dough holds in carbon dioxide ?

In bread making (or special yeasted cakes), the yeast organisms expel carbon dioxide as they feed off of sugars. As the dough rises and proofs, carbon dioxide is formed; this is why the dough volume increases. The carbon dioxide expands and moves as the bread dough warms

Analysis of da vinci's vitruvian man. another of da vinci's most famous works is that of the vitruvian man, created around 1490. the official title of the drawing is “le proporzioni del corpo umano secondo vitruvio,” or “the proportions of the human body according to vitruvius.”

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