Personality tests claim that they can assess and predict our characters, and that some things are unlikely to change. But is this true? Are our personalities anchored in our past or can they evolve..and if so, what factors will contribute to the evolution? Liana talks to Glenn Geher, Ph.D.,  a professor of psychology and director of the Evolutionary Studies program at the State University of New York at New Paltz, about the influences that affect our personality development and the pros and cons of 'personality tests'.