The nation's largest school districts are rushing to fill the coding gap

Sabrina Knight's second-grade students at a Brooklyn public school receive lessons in coding. Some school districts in the United States are attempting to expand computer science education while the Obama administration is pushing to bring the subject to every public school in the nation. On a recent Friday afternoon at a Brooklyn public school, the children of Sabrina Knight's second-grade class listened intently as she used a peanut butter and jelly sandwich to talk about algorithms. Moments later, a student volunteer walked back and forth across the room to demonstrate looping, a technical term used in the field of computer programming. "Thumbs up if you got it," Knight said, as a flurry of 7- and 8-year-old hands and thumbs shot up in the air.