A new study found better results in four-year-olds who go to bed around the same time every night and sleep at least eleven hours.

VOA: special.2010.06.09

In one study, researchers examined the pages of five hundred eighteen-year-olds from the United States.

VOA: special.2009.02.18

The rates,he says,were about twice as high for seven- and eight-year-olds compared to earlier studies.

VOA: special.2010.08.18

Psychology researchers at the University of Bath looked at the hands of seven-year-olds.

VOA: special.2009.02.25

Even the three-year-olds came back to me saying 'Gosh,you know everybody writes.

VOA: special.2011.03.10

Every three years PISA measures the performance of fifteen-year-olds.

VOA: special.2009.07.30