Urban planners in Lidzbark Warminski, Poland have come up with a new "glow-in-the-dark" bike path. It is made with small crystal-like particles of phosphor called luminophores that charge during sunlight hours, and can glow in the dark for up to 10 hours. The path was developed to make bike paths safer and more accessible in the evening. It requires no external power source. The design is currently being tested to see how it survives wear and tear.
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