"The pharyngula stage: the pharyngula is a vertebrate embryo that has assembled the outlines of the body plan. It has the key features of vertebrate morphology -- a post-anal tail, a notochord, a dorsal neural tube, a segmented musculature, and an array of branchial arches ("gill" arches). The major organs have begun to form."
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tags: Delicate Arch, nature, image
Last Friday, we asked readers to identify changes in a painting by Eugène Delacroix, Christopher Columbus and His Son at La Rábida. For the test, the picture flashed maddeningly between its original state and a doctored version Greta made in Photoshop. Here's the original: