For those looking to deepen their understanding of biology, Coursera is a great resource for free classes. Right now there are over 40 online courses listed under biology.  Our top picks include Evolution for Educators, taught by the American Museum of Natural History, and Animal Behavior from the University of Melbourne.  For those interested in systems biology, the School of Medicine at Mt. Sinai is also offering 3 courses on the subject over the next 6 months.

Thanks to Emily Sadigh for the tip!