Photos Of Frozen 'Ghost Apples' Are Going Viral. What Are They?

William Shoemaker, a retired fruit and vegetable horticulturalist from the University of Illinois, pointed out that those apples, leftover from harvest, just went through a week of exceptionally cold weather due to the polar vortex. Besides being somewhat mummified, they could also be rotten, he explained. It happens a lot with apples left on the tree. They maintain their form, but their substance gets closer to applesauce.