© 2017 Positive Behavioral Interventions & Supports (PBIS)
Not surprisingly network economics became a hot topic after the diffusion of the Internet across academia . Most people know only of Metcalfe's law as part of network effects. Network effects are notorious for causing lock-in with the most-cited examples being Microsoft products and the QWERTY keyboard. 
Enrollment is now open for the online specialization certificate taught by Dr. Martin . Seligman and his colleagues at the University of Pennsylvania.
This version includes SiteStudio update and small fixes.
© 2017 The President and Fellows of Harvard College
· It may help reverse the carcinogenic effects of tobacco and improve lung health.