BOSTON, June 11 (UPI) -- U.S. scientists say they've identified specific molecules in the human brain that can awaken and sedate brain stem cells.

HONG KONG, March 21 (UPI) -- Elite ground force units of the People's Liberation Army were involved in China's recent crackdown on Tibetan protesters in Lhasa. A substantial number of images show that the new T-90 armored personnel carrier and T-92 wheeled armored vehicles belonging to the elite ground forces appeared on the streets of Lhasa the same day the crackdown began.

BOSTON, Feb. 23 (UPI) -- Scientists in Boston have been able to regenerate a damaged optic nerve, from the eye to the brain, in laboratory mice.

BUCHAREST, Romania, June 3 (UPI) -- Renault plans to launch the Dacia in Romania this fall with a price tag around $6,000, it was reported Thursday.