Those who wonder just how all of these game makers are actually turning a profit by giving away the games can look at the PlaySpan study as proof that this model works.

FORBES: Blizzard Entertainment Embraces Free To Play Gaming With Hearthstone: Heroes Of Warcraft

Adds psychologist Susan Zafarlotfi, a sleep disorder specialist at Hackensack University Medical Center: "This study shows that CBT as compared to pharmacotherapy works much better ... pharmacotherapy is only a crutch, " while CBT aims to fix the distorted behavior and thought patterns that cause the disorder.

FORBES: Behavioral Therapy 1, Sleeping Pills 0

Unlike existing works that emphasise institutional and historical factors, this study analyses the importance of the presence of fixed costs as a source of market imperfections and very high profits in certain towns.

FORBES: The Market for Lemons and the Start of the Mafia

The white paper, The Power of Like 2: How Social Marketing Works, follows up an initial study last year, this time with control tests on Facebook that isolated the actual impact of Facebook ads on sales, both online and in physical stores.

FORBES: Move up http://i.forbesimg.com t Move down

Prof Daniel Simons, author of the original invisible gorilla study, explained that this effect is not unique to radiologists and reflects the way our attention system works.

BBC: Why do radiologists miss dancing gorillas?