(New York Times) – Some scientists are confident that organs from genetically modified pigs will one day be routinely transplanted into humans. But substantial ethical questions remain.

They are delivered by C-section to protect them from viruses that sows can carry, and bottle-fed instead of nursed for the same reason. They are kept under warming lights and monitored around the clock for the first days of their lives, given toys and marshmallows as treats.

But they don’t get to go outside and play in the dirt like other pigs. They are clones and constitutionally weak, genetically engineered to have kidneys, hearts and livers more compatible with the human body. (Read More)