Why has the glass suddenly shattered in my window?

Toughened glass that has been installed for years does sometimes shatter for what appears to be no apparent reason.

However, there is a reason, with the two most common being due to a Nickel Sulphide inclusion within the glass or an instance of "Thermal Stress". This being where an area of the glass is hotter than another area causing spontaneous fracturing through the glass pane.

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