Tweet makes Word of the Year, while Google beats blog for top word of the '00s
Artificial intelligence should enable robot to speak, carry on conversations
One privacy advocate contends Facebook is pushing users to expect less privacy
Aggressive moves put search giant into phone, cloud computing businesses
Users can find nearby coffee shops, stores or restaurants while walking down the street
University research teams mix nanomaterials that give tumors a one-two punch in trials
Upgraded telescope captures images of 7,500 galaxies - some from 13 billion-plus years ago
Agency hopes space telescope starts finding earth-like planets within three years
Human trials set to begin this year on blood vessels that flex, pulse like real arteries
The two behemoths will battle over search, operating systems, enterprise applications
