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“Happy hour” is not when you might expect it to be, according to a new analysis of about half a billion Twitter messages from around the globe. On average, people are chipper when they wake up and become grouchy as the day wears on.

(PhysOrg.com) -- In what might at first seem obvious, but isn't after further thinking, a group of physicists from the United States and Canada have demonstrated, for the first time, that images generated by light, can be rotated via a rotating medium. In a paper published in Science, physicists Sonja Franke-Arnold, Graham Gibson, Robert W. Boyd and Miles J

Global warming and decades of outmoded fire prevention strategies are merging to set the stage for massive "mega-fires" that scar communities' homes and pocketbooks, according to a new assessment. Preliminary findings from the United Nations' Food and Agriculture Organization (FAO) released this week trace the circumstances around eight mega-fires across the world in a quest to uncover clues on how best to ward them off and minimize their damage.

(PhysOrg.com) -- A team of physicists from the United States and Russia announced today that it has developed a means for computing, with unprecedented accuracy, a tiny, temperature-dependent source of error in atomic clocks.