If you're happy and you know it, did you tweet? (AP)

WASHINGTON – Twitter confirms it: People tend to wake up in a good mood and are happiest on weekends.The fast-paced forum is offering scientists a peek at real-time, presumably little-filtered human behavior and thoughts. Cornell University researchers turned to the microblog to study mood and found a pretty consistent pattern.The researchers analyzed English-language tweets from 2.4 million people in 84 countries, more than 500 million of the brief, conversation-like exchanges sent over two

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