Knowing something is one thing. Grasping it can be something entirely different. I have long known that parents are hard-pressed for time. There’s a lot that goes into keeping a small child alive. You must feed them, change their diapers, stop them from crying and keep them from accidentally killing themselves in a world pretty much designed to harm small, incompetent creatures. These mandatory tasks don’t leave room for things the childless might take for granted, such as an afternoon spent playing a videogame or an unhurried bowel movement.