Libro Que es la Ciencia
Cursos

Academia Khan   http://www.khanacademy.org 
Universia   http://cursos.universia.es/
Cursera    http://coursera.org/
Slate   http://www.slatescience.com
Edex    https://www.edx.org
Udacity    https://www.udacity.com
OpenCulture http://www.openculture.com/freeonlinecourses
OpenOnlineCourses http://onlinecoursespro.com/free-online-courses-database/