That ringing you hear is the sound of the death knell for the "don't ask, don't smell" era of factory farming. Oprah Winfrey's Tuesday show, "How We Treat The Animals We Eat," blew the lid off the battery cage egg industry, shining a long-overdue light on the bleak, black underbelly of sunny-side up.

Investigative reporter Lisa Ling had to don a sanitation suit and cap before leading her camera...