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Thermal imaging camera display screen (upper left) inside a helicopter. The operator is using the controls to pan the camera over a pile of tyres. The thermal imaging camera (mounted outside the helicopter) detects infrared radiation (heat). Objects that are hotter than their background (such as burning objects or human bodies) can be detected by this infrared radiation they emit. Thermal imaging cameras are often used by the emergency services. (KEYSTONE/SCIENCE PHOTO LIBRARY/MICHAEL DONNE)