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Haunted places exist across the globe. From haunted prisons to castles and schools to houses, ghosts continue to make themselves known. Learn about some of the most haunted places on Earth, such as Winchester House and Alcatraz. Then turn out the lights--if you dare.

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Grizzly bears are known for their long claws and sharp teeth. But theres more to this bear than its bite. Learn how grizzlies use their size, sharp senses, and strength to rule North American forests.

American black bears are known for their dark fur and sharp claws. But theres more to this bear than its strong paws. Learn how black bears use their senses, sharp teeth, and hunting skills to make their home in North America.

American black bears are known for their dark fur and sharp claws. But theres more to this bear than its strong paws. Learn how black bears use their senses, sharp teeth, and hunting skills to make their home in North America.

Grizzly bears are known for their long claws and sharp teeth. But theres more to this bear than its bite. Learn how grizzlies use their size, sharp senses, and strength to rule North American forests.

Theyre sneaky. They live underground. And they catch insects right outside their front doors. Look inside to discover what's going on in the world of trapdoor spiders.

They have red marks on their bellies. They spin messy webs. And they got their name from their unusual mating habits. Look inside to discover what's going on in the world of black widow spiders.

In graphic novel format, follow Peter Pea as he travels through and explains the workings of the human digestive system.

Grizzly bears roam forests looking for bugs, berries, and other food to fuel their big bodies. Learn about these powerful herbivores and their habitats in Grizzly Bears.