Cellular ennui
Cellular ennui, or cellular boredom, was a biological phenomenon believed by some to be ultimately responsible for death. Championed by scientists such as Dr. Bathkin of Andros III and Dr. Elias Giger, as of the late 24th century it was considered laughable by the scientific establishment.

Giger believed that the cells in one's body did the "same dull monotonous routine" from the day a person was conceived, repeatedly metabolizing and dividing, until they became bored and simply gave up.

Bathkin believed that the cells needed to be energized, kept in the game by teaching them new mitochondrial tricks. Bathkin died in a shuttle accident before he could finish his work, but Giger followed up on his work and spent fifteen years developing the cellular regeneration and entertainment chamber. During this time, his work was hampered by non-believers that he described as being "soulless minions of orthodoxy."

In 2373, Geiger was conducting his work on Deep Space 9, where he met Weyoun in a chance encounter. Weyoun displayed considerable interest in hearing Geiger's theories. ()
Biology
Medical conditions