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Sea Urchin, Channel Islands    Photograph by Lindsey Hesla, My Shot    Sea urchins brandish their spines on the seafloor near the Channel Islands. Scientists recently discovered that the eyeless invertebrates “see” by detecting light with their spines.

Sea Urchin, Channel Islands Photograph by Lindsey Hesla, My Shot Sea urchins brandish their spines on the seafloor near the Channel Islands. Scientists recently discovered that the eyeless invertebrates “see” by detecting light with their spines.

Human Eye Pictures | ... in the retina at the back of the eye Dimitri Vervitsiotis/Getty Images

Eye cells hold key to human ‘repair kits’

Human Eye Pictures | ... in the retina at the back of the eye Dimitri Vervitsiotis/Getty Images

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