How Does Science Progress and by the Way, What's a Paradigm Shift?
One thing that many consider important to understanding Science and Psychology is the nature of progress in our field. One seminal figure is Thomas Kuhn who emphasizes the role of scientific revolutions and the concept of the scientific paradigm.

The Key Take-Away Points:
Scientific progress isn't always smooth. It is punctuated by Scientific Revolutions where old ideas and theories are overthrown by exciting new ones proposed by brash newcomers. That's a paradigm shift according to some.