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A pelagic, or open-ocean, octopus gives off a neon glow in Hawaii. Most species of octopus have no internal skeleton, unlike other cephalopods.
Visit Mexico with this interactive map.
Signs of and solutions to the world's water crisis.
Try something new, shake off old habits, take risks. The payoff? Fresher photo albums with a whole lot more pizzazz.
More Photo Tips
Explore the wild with award-winning photographer Chris Johns.
Guides by National Geographic photographers.