Have you thought about expanding your knowledge by taking some courses? There are several colleges and other sites that offer free online courses, certificate programs, some degree programs, and education resources for teachers and professors.
Courses are designed to be interesting, fun and rigorous. They are the best online courses, from the best professors and the best schools, spanning dozens of subjects. Some edX courses now offer ID verified Certificates of Achievement.
KHAN ACADEMY: A free world-class education for anyone anywhere. Khan Academy is an organisation on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.