Natural selection may be making society more unequal

Contemporary humans are still evolving, but natural selection favors those with lower earnings and poorer education—according to research from the University of East Anglia.

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Depression (mood)

In the fields of psychology and psychiatry, the terms depression or depressed refer to sadness and other related emotions and behaviors. It can be thought of as either a disease or a syndrome.

The Diagnostic and Statistical Manual of Mental Disorders (DSM) states that a depressed mood is often reported as feeling sad, helpless, and hopeless. In traditional colloquy, "depressed" is often synonymous with "sad," but both clinical depression and non-clinical depression can also refer to a conglomeration of more than one feeling.

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