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2. Glass brick - Wikipedia

   en.wikipedia.org/wiki/Glass_brick

   Glass block wall in Chicago. Glass blocks can provide light and serve as a decorative addition to an architectural structure, but hollow glass blocks are non load-bearing unless stated otherwise. Hollow glass wall blocks are manufactured as two separate halves and, while the glass is still molten, the two pieces are pressed together and annealed.

3. Fused quartz - Wikipedia

   en.wikipedia.org/wiki/Fused_quartz

   [15] [16] For the same reason fused quartz is also the material used for modern glass instruments such as the glass harp and the verrophone, and is also used for new builds of the historical glass harmonica, giving these instruments a greater dynamic range and a clearer sound than with the historically used lead crystal.

4. Quart - Wikipedia

   en.wikipedia.org/wiki/Quart

   The quart (symbol: qt) [1] is a unit of volume equal to a quarter of a gallon. Three kinds of quarts are currently used: the liquid quart and dry quart of the US customary system and the imperial quart of the British imperial system. All are roughly equal to one liter. It is divided into two pints or (in the US) four cups. Historically, the ...