Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy. The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light. The critical component of the photosynthetic system is the water-oxidizing complex, made up of manganese atoms and a calcium atom.

GERMANTOWN - January 21, 2010 (WPVI) -- An 18-year-old has been arrested for using a frying pan to kill a Germantown woman he knew all his life.

And when finally I got to the end of the five-hour drive over the highest motorable pass in the world, it was to learn that the gompa in Hunder was closed.

These trojans can zombify your machine.