Scanning electron micrograph (SEM) of cancellous (spongy) bone of the human shin. Bone tissue is either compact or cancellous. Compact bone usually makes up the exterior of the bone, while cancellous bone is found in the interior. Cancellous bone is characterised by a honeycomb arrangement of trabeculae. These structures help to provide support and strength. The spaces within this tissue normally contain bone marrow, a blood forming substance.  Credit: SCIENCE SOURCE/SCIENCE PHOTO LIBRARY

Scanning electron micrograph (SEM) of cancellous (spongy) bone of the human shin. Bone tissue is either compact or cancellous. Compact bone usually makes up the exterior of the bone, while cancellous bone is found in the interior. Cancellous bone is characterised by a honeycomb arrangement of trabeculae. These structures help to provide support and strength. The spaces within this tissue normally contain bone marrow, a blood forming substance. Credit: SCIENCE SOURCE/SCIENCE PHOTO LIBRARY

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Rhossili  Bay, South Wales, ranked 10th best beach in the world by VK Guy
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Art of Diatom algae (from Ernst Haeckel) B305/0177 Rights Managed Credit: MEHAU KULYK/SCIENCE PHOTO LIBRARY

Art of Diatom algae (from Ernst Haeckel) B305/0177 Rights Managed Credit: MEHAU KULYK/SCIENCE PHOTO LIBRARY

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Marbled tree frog (Hyla marmorata), camouflaged against lichen-covered bark. Credit: Gregory Dimijian/ Science Photo Library

Marbled tree frog (Hyla marmorata), camouflaged against lichen-covered bark. Credit: Gregory Dimijian/ Science Photo Library

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Credit: GEORGETTE DOUWMA/SCIENCE PHOTO LIBRARY  Featherstar on gorgonian coral. The featherstar is a marine invertebrate. It is an ancient and primitive echinoderm, a member of the group of invertebrates that includes the starfish. It uses its feathery and fragile arms to catch and convey microscopic plankton and detritus to its mouth at the base of its arms. Unlike the closely-related sea lily, a featherstar is a free-swimming animal. Photographed at Misool, Raja Ampat, West Papua…

Credit: GEORGETTE DOUWMA/SCIENCE PHOTO LIBRARY Featherstar on gorgonian coral. The featherstar is a marine invertebrate. It is an ancient and primitive echinoderm, a member of the group of invertebrates that includes the starfish. It uses its feathery and fragile arms to catch and convey microscopic plankton and detritus to its mouth at the base of its arms. Unlike the closely-related sea lily, a featherstar is a free-swimming animal. Photographed at Misool, Raja Ampat, West Papua…

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Pictographs in The Great Gallery, Canyonlands National Park, Utah USA. Credit: KEITH KENT/SCIENCE PHOTO LIBRARY

Pictographs in The Great Gallery, Canyonlands National Park, Utah USA. Credit: KEITH KENT/SCIENCE PHOTO LIBRARY

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