A relative of mine recently had heart surgery of a type that is fairly routine nowadays. But when I think of the fact that you can pull apart someone's rib-cag

A relative of mine recently had heart surgery of a type that is fairly routine nowadays. But when I think of the fact that you can pull apart someone's rib-cage, stick knives into their heart and then put it all back together again such that the person is walking about not long after, I am still impressed.