DynaSoar writes "MSNBC reports on an elegant hack performed on the common fluorescent tube. By mixing phosphorescent material with the usual white fluorescent material, American Environmental Products has developed a tube that continues to glow when shut off. Originally intended for submarines, and then used in places where terrorists could disrupt services, they are also perfect for power outages, providing some light so you don't have to thrash around in the dark looking for your candles and flashlights. Since the 'hack' is inside the tube, they can also be removed from their fixtures and carried around, as well as provide light even if they're shattered."
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