Halvorson's study in his research found out that the children developed the thumb that is common in slightly older, more motorically advanced children.
It should be noted that a research simply means an investigation that's done to know more about a particular thing.
In this case, Halvorson's study in his research found out that the children developed the thumb that is common in slightly older, more motorically advanced children. His youngest subjects couldn't use the thumbs.
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