Extras

Eye-catching studies that didn't make the final cut:

How much should recycling signs acknowledge the inconvenience of recycling?

Amount of attendance at religious ceremonies, but not regular prayer, is associated with people expressing greater support for suicide attacks.

Researchers create rat casino to study problem gambling.

Agreement with the statement "I felt depressed" predicts the likelihood of an older adult dying over the next five years. (hat tip: mind hacks).

Introducing the wonderfully named Jackson-5 scales.

Differences in the perceived route to happiness across 27 nations fell into three distinct categories.