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Young children who use gestures outperform their peers in problem-solving tasks, says a new study. Children aged between two and five were asked to sort cards printed with colored shapes first by color, then by shape. Making this switch can be tricky but the study found that kids who gesture are more likely to make the mental switch and group the shapes accurately.

Games have long been accused of making players violent, but evidence has been building over the years that they can have positive effects. Scientists say they are not only understanding why, but they also trying to put these observations to the test.