Charlie and Lettie, three-years-old, add pebbles to a balance scale. After adding a similar pebble to each side of the scale, Charlie exclaims, “It’s even. These guys are even” (00:19). What do you think Charlie assumes is even? Is he referring to the number of pebbles, one per side? Does he mean the arms of the scale are even (parallel) with the tabletop? Notice Charlie does not drop the pebbles onto the scale; he gently places them. His measured actions suggest that Charlie may sense that the weight of the pebbles will counter each other, thereby causing the scale to return to equilibrium.