Like most computer hobbyists and programmers, I've amassed boxes of USB cables to connect USB, Micro-USB, and Mini-USB to chargers, computers, and gadgets. These cables are a mix of phone charger cables, and cables that came with external hard drives, bike lights, GPS units, and other miscellaneous gadgets.
Bipolar Disorder. Causes of Bipolar Disorder. Both genetic elements and environmental factors can create vulnerability to the disorder, so the causes vary from person to person. While the disorder can run in families, no one has definitively identified specific genes that create risk for developing the condition.
Researchers have discovered that some people with bipolar disorder have: 1  biochemical imbalances of hormones and certain neurotransmitters in the brain; especially dopamine, serotonin, norepinephrine, and acetylcholine. 2  1. 3  an over-secretion of cortisol, a stress hormone.