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Many studies of household instability focus on how parental divorce or a mother’s romantic relationships influence how often a family relocates and who moves in or out of the home.

This research roundup, originally published in May 2019, has been updated to include a recent systematic review and meta-analysis looking at the effects of screen time on academic performance.

Gone are visions of idyllic childhoods spent frolicking in fields and playing in pastures; for many kids, green grass has been replaced with smartphone screens.

An estimated 16.5 percent of children in the United States — about 7.7 million kids — have been diagnosed with depression, anxiety or attention deficit hyperactivity disorder, but about half don’t receive the help they need, according to a new research letter in JAMA Pediatrics.