Four questions. Five answers. Which one doesn't belong?

The five answers

Celluloid
Glass
Nylon
Polyester
Teflon

The questions

Which material was originally developed as a substitute for ivory and became one of the earliest plastics?
Which material is primarily made by heating sand at extremely high temperatures?
Which material was invented after a scientist accidentally discovered a substance that would not stick to most surfaces?
Which synthetic material was first introduced commercially in the 1930s and became widely used in stockings?

Reveal the answers

Celluloid
Glass
Teflon
Nylon

The False Five: Polyester

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