Input (grade 13): The project was led by Udi Manber of Google, announced December 13, 2007, and was opened in beta to the public on July 23, 2008 with a few hundred articles mostly in the health and medical field.
Output (grade 6): The project was announced on December 13, 2007 and opened in beta to the public on July 23, 2008. When it was opened, there were a few hundred articles mostly about health and medicine.