2 previous post reminded of the death of the Titanic, as well as the achievements of the time in engineering. Time goes by, new technologies, new things in our lives replacing outdated. But there are things that leave the puzzle for many, many years. One of these items is the set of "Chinese musical balls." I think many people have seen these "miracle beads" in the sale, but few people know about their history and their effects. More recently I bought myself like that. Purchased 2 sets of balls. The first balls were 35 mm in diameter.

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