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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.


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


 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.


 insect flower vision camera ultraviolet eye sight navigation