They can be made of almost anything that floats. Wood, plastic, Styrofoam and other buoyant materials all work pretty well.
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No, a fair bit of items were made by mistakes but not everything was made by a mistake.
Chocolate is made in Hershey, Pennsalvania
Hornbooks were made from hairs of animals
The flute was made about 3000 years ago, But the first one was made in the 1830sdone by cklein
Persian rugs are made in Iran.