Quoting Fan et al. (2017): “Group-level manual laterality in humans is related to hemispheric functional lateralization and cognitive functions”.... Just kidding, sometimes hand and brain stuff can sound very complex and confusing, we know! So here's the lowdown just for you: The intricate and detailed connections in primates between how our brains function and how our hands work IS really complex. And it’s REALLY cool too! Because when you take a moment to pause and appreciate how amazing it is that you can think a thought in your mind with your imagination and then actually bring that idea to life in the physical world by using your hands, it’s an astonishing reminder of just how amazing our human bodies really are. Your dog can’t do that. Nor can your cat, or the bird flying by outside. Not even that raccoons who manage to pull the lid off the garbage cans no matter how hard you try to stop them from getting in there, can use their brains and hands the way we do.