Today I want to indicate you a couple of websites you may find very interesting especially if you would like to learn new things in your free time (yes why not?) Coursera Citing wikipedia Coursera is a for-profit educational technology company founded by computer science professors Andrew Ng and Daphne Koller from Stanford University that offers massive open online courses (MOOCs). Coursera works with universities to make some of their courses available online, and offers courses in physics, engineering, humanities, medicine, biology, social sciences, mathematics, business, computer science, and other subjects. As of April 2014, Coursera has 7.1 million users in 641 courses from 108 institutions. The website and the lectures and the hosted material (videos, assignment, lecture notes) are 100% free but in some cases a fee applies to get ( after the final passing of the exam ) an official certificate. The courses are really well done and taught by some famous prof...