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These candy-colored "trees" are actually the cells that enable you to see in the dark. They're called rod cells, and humans have some 120 million of them lining the back of the eye, shooting signals to the brain when they're stimulated by light. Rods are sensitive to very dim light, unlike their counterparts, cones, which allow us to see color.

These candy-colored "trees" are actually the cells that enable you to see in the dark. They're called rod cells, and humans have some 120 million of them lining the back of the eye, shooting signals to the brain when they're stimulated by light. Rods are sensitive to very dim light, unlike their counterparts, cones, which allow us to see color.

Phoenix Zoo and Jane Goodall Institute Join Forces to Improve Animal Welfare Around the World – National Geographic Society (blogs)

Phoenix Zoo and Jane Goodall Institute Join Forces to Improve Animal Welfare Around the World – National Geographic Society (blogs)

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