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Photo of the day

Magnified 20x, the dot on the border between the two polygons can be seen as a small sphere. This is the nickel sulfide inclusion. It is hard to imagine that this tiny dot caused an entire sliding door glass to shatter, but it's true. The phenomenon of nickel sulfide inclusions causing tempered glass breakage has been known by manufacturers since the late 1940's and was first identified in an industry article in 1961.