The once-athletic Angel, 23, suffers from episodes of muscle pain so severe she often can't move. As she begins a nursing career, she needs answers.

The parents of bright and charming Sadie, 7, seek alternatives to the devastating brain procedure doctors propose to treat her frequent seizures.

Day by day, Willie, 46, loses pieces of himself. He has memory loss, seizures, mood swings, a brain lesion -- but no diagnosis. Can the crowd help him?