Bone marrow is the soft, fatty tissue inside large bones like the hip and thigh bones. It develops the body's red blood cells that carry oxygen, white blood cells that fight infections, and platelets ...

It's lined with mucous and helps regulate pressure around the eardrum so that sound waves can be transferred. Ears can vary, so what's considered normal anatomy of the inner or outer ear in one person ...

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A photo posted by on The reason? Woodlice look like feeding piglets or pigs huddled in a pen. Presumably the same thought struck the classifiers who placed common varieties in the porcellionidae ...