aggressiveness

The fittest males don't always get the girl, biologists report. Study tackles a paradox in species from fruit flies to humans: If warriors win the spoils, why don't males evolve towards super-aggressiveness?

Female fruit flies sometimes choose males who win fights, sometimes choose males who do not fight, and sometimes choose males for no obvious reason, say biologists.

Bipolar Disorder (BPD or manic-depressive illness) is one of the most serious of all mental disorders, affecting millions of individuals worldwide.

Affected individuals alternate between states of deep depression and mania. Now, a mouse model of the disease has been developed.

Researchers found that the glutamate receptor 6 (GluR6) gene is associated with bipolar disorder. Mice that were missing the GluR6 gene underwent a series of tests designed to approximate the symptoms of mania.