Images Dated 16th March 2004

Heart of stone

Heart of stone, computer artwork. The heart is a hollow sac (lower frame) of muscular tissue that pumps blood around the body. Small surface coronary blood vessels supply the heart muscle with blood. Four major blood vessels (upper frame) bring blood to and from the heart. From upper left to centre right they are: the vena cava (vein returning deoxygenated blood from the body); the aorta (artery through which oxygenated blood is pumped to the body); the pulmonary artery (taking deoxygenated blood to the lungs); and the pulmonary vein (bringing oxygenated blood from the lungs). People lacking feelings are said to have a heart of stone. See P216/387 for a heart of gold

© ROGER HARRIS/SCIENCE PHOTO LIBRARY

N.A., USA, Oregon, Oregon Dunes National Monument Dune grass blowing in the wind

USA, Oregon, Oregon Dunes National Monument. Dune grass blowing in the wind (Ammophila arenaria)

© Adam Jones / Danita Delimont, Agent

Adam Jones, Beach, Blur, Coast, Danita Delimont, Dune, Environment, Landscape, Motion, National Monument, Nature, North America, Oregon, Oregon Dunes National Monument, Pacific Northwest, Plant Life, Sand, Shore, Usa, West, West Coast, Wind

Emperor penguin chicks huddling

Emperor penguin (Aptenodytes forsteri) chicks huddling for warmth in the Antarctic spring. These grey-feathered chicks are about one month old. The adults feed them by regurgitating fish. These are the only penguins to breed in the Antarctic during the winter. Each pair produces a single egg, which the males incubate on their feet, surviving the extreme cold by huddling in large groups. Males fast during the two month incubation period and lose almost half their body mass by the end. The emperor is the largest penguin, standing around 115 centimetres tall and weighing 30 to 40 kilograms. Photographed in September at Dawson-Lambton Glacier, Antarctica

© DOUG ALLAN/SCIENCE PHOTO LIBRARY