What Are Those Grids of Glass in the Sidewalk — And Why Are They Purple? | Bay Curious | KQED News

https://www.kqed.org/news/11791667/what-are-those-grids-of-glass-in-the-sidewalk-and-why-are-they-purple

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First saved: 2020-Jan-04 (Sat)
Last checked: 2020-Jan-04 (Sat), response 200