Some days are suited for reflection and today is one of those. I am thinking of how grateful I am to members of the surgical team who replaced my husband’s aortic heart valve earlier this year. It is amazing to think that such an intricate surgery is considered commonplace, with about 80,000 adults in the United States having this procedure each year. I am also thinking of how grateful I am to the livestock farmer or rancher who raised the animal from which the valve came. . . .