It's a bird, it's a plane, NO! it's

Krypton was discovered in Britain in 1898 by Sir William Ramsay.  Its was discovered by evaporating liquid air and the residue that was left, there it was.  It is a colorless gas, exhibiting a whitish glow in a high electric field. It is used in high speed photography, it is used in light bulbs and in signs to make the glow brighter.

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