Good day, bad day: August 21, 2012

GOOD DAY FOR:

Dental hygieneA study finds that brushing your teeth regularly may help fend off dementia. [Newser]

Stimulating the economyIn its new quarterly earnings report, Barnes & Noble partially attributes its strong growth figures to booming sales of the erotic trilogy Fifty Shades of Grey. [AP]

Canine psychiatristsA new study finds that some dogs who chase their tails may be suffering from obsessive-compulsive disorder. [Geekosystem]

BAD DAY FOR:

Modern chivalryTwo passersby in New Jersey rush to help a woman who they believed was defending herself against a robber, only to find out that it was the woman who allegedly robbed the man. [Gawker]

Keeping your syphilis a secretTwo major porn studios suspend production after discovering that a male performer was forging his STD tests and keeping his syphilis infection a secret. [TIME]

Paying homage to Fight ClubThree daycare workers are arrested for running an organized fight ring with their children. [Death & Taxes]

For more winners and losers see: Good day, bad day: August 20, 2012