Martin Seligman, the father of positive psychology, theorizes that while 60 percent of happiness is determined by our genetics and environment, the remaining 40 percent is up to us.
Ioannis Nikolaou‘s insight:
Πόσα από αυτά κάνετε (κάνουμε);
See on www.huffingtonpost.com
ΙΩΑΝΝΗΣ ΝΙΚΟΛΑΟΥ 