Lori Schappell

Two bodies and one mind, this is the extraordinary story of one pair of conjoined twins in today's world.

Conjoined twins are among the rarest of human beings. There are probably fewer than a dozen adult pairs living in the world today. Only a few hundred pairs of conjoined twins are born in the whole world each year - they appear about once in every 100,000 births - but more than half of them are stillborn, and one in three live for only a few days.

Hotshot plastic surgeons Dr. Sean McNamara and Dr. Christian Troy experience full-blown midlife crises as they confront career, family and romance problems.

Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.