National

May 1, 2013 5:12 AM by Lacey Steele

Saddest day in five years

April 15, the day of the Boston bombings, was the saddest day in five years, according to a new website that monitors mood via twitter.

The website was created by mathematicians at the University of Vermont.

They calculate happiness levels by analyzing the words used in fifty million tweets from around the world.

 

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