Ever so slowly researchers are beginning to identify some of the molecular and cellular triggers of depression, including stress hormones run amok and bad genes.

FORBES: Think Happy

In a paper published this month in the journal Molecular and Cellular Proteomics, Buchholz, Spalding and their colleagues showed that after examining 44 teeth from 41 people they could determine ages within about two years--far better than more common methods like looking at patterns of wear and the changes that proteins in the teeth undergo as people age.

FORBES: Out Of The Labs

Damage that occurs at the cellular or molecular level can disrupt the body's natural control processes and allow an uncontrolled growth of cells, or cancer.

WSJ: Radiation's Effect Depends on Amount