Images Dated 25th March 2002

Computer hard disk read/write head, SEM

Computer hard disk read/write head. Coloured scanning electron micrograph (SEM) of the read and write electromagnetic device (head) of the hard disk of a computer. Computers store data on magnetic media, with the polarity of the magnetism (up or down) corresponding to the one or zero of computing binary code. An electromagnet (grey block, upper left) is magnetised using electricity from the wires seen at lower centre. It is then used to alter the magnetism of the disk, writing data onto it. This device also reads data from the disk. The hard disk (seen in background) rotates. The head moves radially above the disk to access all parts. Magnification: x20 at 6x7cm size

© POWER AND SYRED/SCIENCE PHOTO LIBRARY

African Lions investigate Elephants (Panthera leo), Masai Mara GR, Kenya

© Mc Donald Wildlife Photog. / Animals Animals/Earth Scenes

Aa Photographer, Action, Africa, African Elephant, African Elephants, African Lion, Alert, Animal, Animalia, Big Cat, Big Cats, Botany, Carnivora, Carnivore, Carnivores, Cat, Chordata, Concept, Confrontation, Crouch, Crouching, Diverse, Diversity, Elephant, Elephantidae, Emotion, Environment, Environmental, Eutheria, Felidae, Feliformia, Feline, Game Refuge, Game Reserve, Grass, Grasses, Grassland, Hunt, Hunting, Joe Mc Donald, Joe Mcdonald, Kenya, Landscape, Laws Of Nature, Laying Down, Lion, Location, Loxodonta, Loxodonta Africana, Lying Down, Maasai Mara, Maasi Mara Game Reserve, Mammal, Mammalia, Mara, Masai Mara, Masai Mara Game Reserve, Mc Donald Wildlife Photog, Mcdonald Wildlife Photog, Natural, Nature, Out Side, Outdoor, Outdoors, Panthera, Panthera Leo, Pantherinae, Plant, Predation, Proboscidea, Rest, Resting, Scen Ic, Stalk, Stalking, Theria, Variety, Vertebrata, Watching, Wild Life

African Elephant young males play fighting (Loxodonta africana), Masai Mara, Kenya

© Mc Donald Wildlife Photog. / Animals Animals/Earth Scenes

Aa Photographer, Action, Africa, African Elephant, African Elephants, Age, Animal, Animalia, Bull, Chordata, Elephant, Elephantidae, Environment, Environmental, Eutheria, Event, Fight, Fighting, Game Refuge, Game Reserve, Gender, Joe Mc Donald, Joe Mcdonald, Kenya, Location, Loxodonta, Loxodonta Africana, Maasai Mara, Maasi Mara Game Reserve, Male, Mammal, Mammalia, Mara, Masai Mara, Masai Mara Game Reserve, Mc Donald Wildlife Photog, Mcdonald Wildlife Photog, Natural, Nature, Number, Out Side, Outdoor, Outdoors, Pair, Play, Playing, Practice, Proboscidea, Theria, Train, Training, Vertebrata, Wild Life, Young, Youth