Eroding the Sphinx
One theory suggests that the Great Sphinx of Giza formed -- in part -- naturally as a result of erosion, and ancient Egyptians added features to the bedrock formation. To test the plausibility of the theory, researchers made a miniature sphinx. (Image credit: S. Boury et al.)
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Tornadoes in a Bucket
In nature, some powerful tornadoes form additional tornadoes within their shear layer. These subvortices revolve around the main tornado, causing massive destruction in their wake. (Image and research credit: G. Di Labbio et al. 1, 2)
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