Diane finds two small, red bumps on her foot; within hours her foot is swollen and appears black and blue; despite undergoing tests, the medical team has no diagnosis. Walt has always been in good ...

In the late 1800s, Smithsonian ornithologist Robert Ridgway sat at his desk, surrounded by watercolors, papers, pens, crayons, and dead birds, carefully preparing the illustrations that would make it ...

A doctor makes an unexpected discovery when he operates on a young woman; doctors try to reach a diagnosis when a marathon runner experiences mysterious fatigue. A man suffers from a series of ...