Christopher and the Minneapolis bridge

Today Christopher & Sarah were over at my parent's house while Mindy was running errands. Christopher saw the Minneapolis bridge disaster on CNN. Nana (my mom) told him that the bridge collapsed. He asked why. She told him that we don't know yet. After a few minutes he asked why again. Same answer. Then he went off to another room for a few minutes and came back to my mom. "I know why the bridge collapsed" he announced. "Why?" she asked. "Because it was too thin underneath." Wow. We were all pretty impressed with what he came up with today out of the blue.