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according to recent data from the U.S. Department of Education, black children are 3.6 times more likely to be suspended from preschool than white children. Put another way, black children account for roughly 19 percent of all preschoolers, but nearly half of preschoolers who get suspended.

One reason that number is so high, Gilliam suggests, is that teachers spend more time focused on their black students, expecting bad behavior. "If you look for something in one place, that's the only place you can typically find it."

The Yale team also asked subjects to identify the child they felt required the most attention. Forty-two percent identified the black boy, 34 percent identified the white boy, while 13 percent and 10 percent identified the white and black girls respectively.

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It's impossible to separate these findings from today's broader, cultural context — of disproportionately high suspension rates for black boys and young men throughout the school years, of America's school-to-prison pipeline, and, most immediately, of the drumbeat of stories about black men being killed by police.

If implicit bias can play a role on our preschool reading rugs and in our classrooms' cozy corners, it no doubt haunts every corner of our society.