What is behavioral science?

How can I effectively describe the Behavioral Science major to an uninformed colleague? To do this, imagine that you have just stepped into an elevator and
have met someone (for example, the hiring manager of a local company or non-profit agency) who asks you about your major, but doesn't know what
Behavioral Sciences is or how it can be applied. Assume that the person has a university degree, but not in the Social Sciences. Imagine that you have only
two minutes in which to communicate your message and leave a lasting positive impression. What would you say? How would you begin?.