1.  Among those who develop color-blindness after birth, the causes include injury, illness or exposure to a toxic drug or chemical.

2.  Experts say the trend's causes include the weakness of labor unions and the oversupply of Mexican immigrants willing to work for low wages.

3.  His causes included the hiring of blacks by San Francisco's Municipal Railway, desegregation of the city's municipal labor unions and improvements in public housing.

4.  Her pet causes have included women's issues, children's literacy, and infant mortality.

5.  Less common causes include genetic disorders, chemotherapy for cancer and viral and other infections.

6.  Other causes include valvular heart disease, an overactive thyroid, infections, and excessive alcohol consumption.

7.  Other possible causes include surgery, pregnancy and some medications.

8.  Other possible causes include medications, like prednisone or other corticosteroids; isoniazid, a tuberculosis drug; barbiturates, and lithium.

9.  Prominent other causes identified include the availability of guns and other weaponry, providing youths opportunities to act on motives that otherwise might dissipate.

10.  Possible causes include a conflict between programs that you're running, damaged program files, or hardware driver files that are not up-to-date.