New PDF release: National Geographic (February 2016)

Nationwide Geographic, previously The nationwide Geographic journal, is the legit journal of the nationwide Geographic Society. it's been released consistently on the grounds that its first factor in 1888, 9 months after the Society itself was once based. It basically comprises articles approximately geography, heritage, and global tradition. The journal is understood for its thick square-bound smooth structure with a yellow oblong border and its vast use of dramatic photographs.

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Extra info for National Geographic (February 2016)

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The squid’s eye, like ours, works as a camera does, with a single lens focusing light onto a single retina, full of photoreceptors—cells that absorb photons and convert their energy into an electrical signal. By The pair of black dots on the head of the flatworm Dugesia dorotocephala represent some of the simplest true eyes: unembellished pits that can sense the direction of incoming light but lack any kind of focusing lens. contrast, a fly’s compound eye divides incoming light among thousands of separate units, each with its own lens and photoreceptors.

At right, a view of Charles Darwin as he might appear to a squid with this correction (far right) and without it. depth in a column of water. You don’t need a true eye for this; an isolated photoreceptor will do. Hydra, a small relative of jellyfish, has no eyes, but it does have photoreceptors in its body. Todd Oakley and David Plachetzki from the University of California, Santa Barbara, showed that these receptors control hydra’s stinging cells, so that they fire more easily in darkness. Perhaps this allows the creature to react to the shadows of passing victims or to reserve its stings for nighttime, when its prey is more common.

EXPLORE Earth Parks Planet Earth: Waco Mammoth National Monument National Geographic visits some of the lesser known sites in the National Park Service system WACO, TEXAS TEXAS Waco ESTABLISHED JULY 2015 At this ive-acre site—one of the most recent additions to the National Park Service system—the dig shelter offers a close-up view of mammoth bones left exactly where they were found. Exploring a dry Texas creek bed in 1978, two young men found bones clearly too large to have come from a cow. A museum staffer at nearby Baylor University identiied them as the remains of a Columbian mammoth, an extinct species that grazed here during the Ice Age.

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