Everything seems possible today thanks to Artificial Intelligence. But how successful will it be? Whereas more than ever before, technology is a driving force of evolution in our society, that driving force is now running riot. It worries a lot of computer programmers, the very creators of this AI, some of who have even become whistleblowers. It has become urgent to unveil the scientific foundations of "deep learning" and the new "intelligent algorithms" in order to better understand how, more and more often, machines make our decisions.