Jigsaw puzzles = festive rows

Jigsaw puzzles can be responsible for family arguments over the festive period, new research suggests. There are different strategies to completing jigsaws - a person can be either a "border obsessive" or an "opportunistic" jigsaw puzzler. Arguments break out when individuals collaborate with people who have a different strategy. This can lead to acts of one-upmanship, such as hiding the last jigsaw piece...
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