School is a lot different today than it was two years ago at P.S. 171, Patrick Henry Preparatory Academy in Harlem, NY. In 2016, when teachers wanted students to use computers in class, they rolled in the computer cart. Students lined up, took the laptops from the cart and brought them back to their seats. At the end of class, students lined up again to put the laptops back in the cart so they could be rolled over to the next classroom.