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It eliminates the need for chlorine and iodine tablets which take 30 minutes to work and can leave an unpleasant taste.

2010-08-18

 water ultraviolet sterilization
Arctic reindeer can see beyond the "visible" light spectrum into the ultra-violet region...

2011-05-26

 Arctic reindeer ultraviolet animal vision sight eye evolution bumblebee colour
What insects see when they approach a flower is very different from what is visible to the human eye. Professor Iain Stewart uses an ultra-violet camera to reveal the markings some flowers have developed to attract pollinating insects.

2012-02-14

 insect flower vision camera ultraviolet eye sight navigation