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As ever shouldering his responsibility to tackle moral gray areas, William Saletan offers an enlightening (if unsettling) look into the battle over our organs.

How can we get more organs? By redefining death. First we coined “brain death,” which let us take organs from people on ventilators. Then we proposed to allow organ retrieval even if nonconscious brain functions persisted. That goal has now been realized through “donation after cardiac death,” the rule applied in Denver, which permits harvesting based on heart, rather than brain, stoppage.

Stoppage is complicated. There’s no “moment” of death. Some transplant surgeons wait five minutes after the last heartbeat. Others wait two. The Denver team waited 75 seconds, reasoning that no heart is known to have self-restarted after 60 seconds.

Despite my reservations about infographics, The Economist had a too-interesting-to-ignore one yesterday about postmortem organ donation. What’s really interesting is that the United States is second to Spain, which requires people to opt-out of donations.