(This is a lightly-edited version of a column I wrote for the Milwaukee Journal Sentinel that ran in the Dec. 8, 2019, print edition.)

Dana Suskind is a surgeon at the University of Chicago whose specialty is providing kids who have little or no hearing with high-tech cochlear implants that allow them to hear much better. But she noticed about a decade ago that some of her young patients had much better outcomes than others after receiving the implants.

“It was a really painful experience to watch” kids who now could hear but weren’t thriving. She worked to find the reason. Her conclusion: The problem “had less to do with their hearing loss and more to do with the environment into which they were born.” Generally, their lives were shaped by poverty, instability, high stress and limited exposure to experiences that are intellectually and emotionally beneficial.

Much the same is true for millions of children who are born with normal hearing. By the time they reach kindergarten, they are nowhere near as ready for school as children who with better lots in their early years.

Suskind became founder and co-director of a project called Thirty Million Words. The name came from a study from several decades ago that concluded that, by the time they reached school age, low-income children had heard 30 million fewer words in every-day conversation than children from higher income homes. This limited their educational readiness.