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https://ceramics.org/ceramic-tech-today/video-superfest-a-look-at-east-germanys-extremely-durable-drinking-glass
Superfest, chemically strengthened glass
Superfest, chemically strengthened glass
submitted by solbt to todayilearnedNobel Prize for Lobotomy

The Bureau of Engraving and Printing sells them through the official government website, priced above face value as collectibles. Every note can be cut out and spent. Handing the whole sheet to a cashier is also valid, though they will silently curse you.
Credit: JFitz717