The ozone layer protects living things on the Earth's surface from the Sun's ultra-violet radiation.

BBC: Ill wind 'killed dinosaurs'

Anglican churches are now introducing SmartWater which is painted on items and glows under ultra-violet lamps identifying the owner.

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Some feared that ultra-violet rays from the concert lights would affect the marble.

ECONOMIST: Rock the Taj

The action of ultra-violet light from the sun on a molecule called 7-dehydrocholesterol, found in the skin, turns it into the vitamin.

ECONOMIST: Schizophrenia: Let the sun shine in | The

But the increased ultra-violet (UV) solar radiation which the damaged ozone allows through to the surface of the earth is a threat to all living things.

BBC: By Environment Correspondent Alex Kirby

Sometimes ultra-violet radiation is used to treat psoriasis and eczema.

BBC: Doctors warn against sunbed use

Sunbeds work by exposing the skin to ultra-violet radiation.

BBC: Doctors warn against sunbed use

The discover section of the site provides an insight into the science behind the study of Leonardo's work, including explanations and images of infra-red, ultra-violet and my favourite, the "computed axial tomography" of some of da Vinci's work.

BBC: 8bitpeoples

Held in a scoop on the rover's mechanical arm, the tablespoon of pulverized gray rock offers planetary scientists their first sample from the planet's interior, where it may have been sheltered from the harsh surface chemistry and ultra-violet radiation.

WSJ: Rover on Mars Extracts First Rock-Core Sample

They're not X-rays, or gamma rays, or ultra violet.

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