* Birds grasp key rule of grammar, study finds:
The European starling has an unsuspected ability to pick up "human-only" language skills, researchers suggest.
* Brain cells that track values of objects:
Researchers say they may have found some brain cells that participate in our purchasing choices.
* Order from chaos:
One of nature's deepest puzzles is illustrated by some surprisingly common events in which disorder, inexplicably, produces its opposite.
* Face transplant patient said to be healing:
The world's second face transplant, performed in China, has been a success so far, Chinese media reported.