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A simple shape in the doorway is visible here, the unmistakable outline of someone toiling at their custodial duties . Photo by Brad Smith See more of the best photos of 2011

A simple shape in the doorway is visible here, the unmistakable outline of someone toiling at their custodial duties . Photo by Brad Smith See more of the best photos of 2011

Have you ever walked into a room and realized you don’t remember what you’re doing there? Yeah, us too. Well thankfully science finally explains why: It’s the doorway’s fault, a new study finds.