OKLAHOMA CITY — Two third-graders sat on the floor of their classroom and lined up a row of dominoes along the edge of a low-lying table. They positioned themselves at each end of the row of rectangles, leaned in, and blew. The dominoes tumbled forward, crashing into each other. The girls flung their heads back and laughed.

In another part of the room, two students spontaneously connected a set of wooden orbs to sticks to mimic planets circling a sun.

“It’s a solar system,” one of the students said.

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