Two hands are better than one

What are you doing right now other than scrolling through this article? Do you have a cup of coffee in one hand, your phone in the other? Maybe your right hand is using your laptop mouse and your left hand is holding a snack. Have you ever thought about how often we are using both of our hands? Having two healthy human hands allows us to carry too many grocery bags in one hand and unlock our apartment door with the other, and perform complex bimanual coordination like playing Moonlight Sonata by Beethoven on the piano (well, maybe not all of us can do that). Having two hands also allows us to do some of the most simple tasks in our daily lives, like holding a jar of peanut butter and unscrewing the lid, or putting our hair up in a ponytail.