In the scene, an aquarium bowl filled with marbles is shown, followed by Robert and General Groves walking outside Los Alamos. Robert inquires about the progress of their work, to which General Groves responds with a rhetorical question about the two years and a billion dollars’ worth of investment:
ROBERT: Well, hard to put a price on it.
General Groves: Not really, just add up the bills. "Rural free deliveries." Eighty babies delivered the first year. This year, we've had ten a month.
Why did General Groves mention the baby delivery count here?