Does this disappearing organ hold the secret of longevity?

Nestled beneath the sternum in the upper chest is a soft, overlooked organ that quietly shrinks with age.

This organ, the thymus, was named by the Greeks, who believed it was home to the soul. The word itself means soul in Greek.

Long seen as an organ that outlived its usefulness after childhood, the thymus is now attracting renewed interest. Scientists increasingly believe it could hold c...