AS COOLER temperatures arrive in September, gardens in the northeast U.S. stand tall against clear blue skies and look happy again after months of drought and withering heat. I was eager to draw my ...
5monon MSN
Understanding why rose petals curl: How stress, geometry, and biology shape their elegant forms
Rose petals' unique shapes come from stress during growth. Differential growth and mechanical stresses create curled edges. Research shows petals violate a mathematical condition, causing stress.
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