A startling statistic scrolls across the screen: “25 million parents in the United States rely on child care in order to get to work.” Jen Bradwell and Todd Boekelheide, husband-and-wife directors of “Make a Circle,” a new documentary about child care struggles and advocacy, say they extrapolated this estimate with the help of of Krista Olson, a researcher at The Center for the Study of Child Care Employment (CSCCE) at the University of California, Berkeley.