 Pigs and slop go hand in hand, but WTOP's Ian Crawford says some of those animals, which live only a few hours away, are among the cleanest you'll ever find. That's because these pigs near Blacksburg, Virginia, are being raised for animal-to-human organ transplant. Revivacor, genetically engineering the swine to make their hearts, kidneys, and other organs more human-like. Revivacor's parent, United Therapeutics, is now preparing for formal clinical trials on the organs created in Virginia.