More and more teenagers and young people have access to online resources. In this sense, the digital gap is narrowing and the possibilities for these people are expanding. But this trend entails some risks, such as exposure to harmful content or the manipulation of sharing private information; in addition, these media greatly influence, for better or worse, the way in which young people behave and feel about the content they find in them. At the same time, given the advance in the development of the media and the flow of information, it is essential that teenagers and young people develop certain skills such as secure access to content, critical analysis and evaluation of sources in order to process information effectively. Thus, in 2011 a new discipline emerged: "Media and Information Literacy (MIL)". According to UNESCO's most widely used definition, "MIL is a set of capabilities that enable people to access, retrieve, understand, evaluate and use, create and share information and media content in all formats, using different tools, in a critical, ethical and effective way, in order to participate and engage in personal, professional and social activities." The ultimate goal of MIL is to empower people to take advantage of their universal rights, such as freedom of opinion and expression, for the benefit of all individuals, taking advantage of emerging new opportunities in the most effective, inclusive and ethical way possible. With such a broad theme, MIL includes many important concepts such as digital transformation, digital rights and well-being, new technologies, content creation, communication and outreach, safe internet, media literacy and human rights education... And among them, critical thinking is fundamental. UNESCO defines it as "the ability to analyze information and ideas to understand and evaluate one's own values and beliefs, rather than simply taking proposals at face value." A critical eye has a decisive influence on human behaviour: for example, when faced with disconcerting news, a person with a critical mind does not jump to conclusions or immediately share the information provided with others before it is questioned. On the contrary, they seek verification and logic of the message. Likewise, a person with a critical spirit is able to evaluate the reasoning behind the format, time and form chosen for communication. As the media is exposed to and controlled by many elements, being critical of the information we consume helps us form our personal opinions and oppose attempts to be deceived through controversial sources. Thus, education in values seems increasingly urgent with hate speech, gender violence, sexual harassment, homophobia, misinformation, in a society where inequality, radicalism of all kinds or environmental irresponsibility proliferate. And this education must emphasize critical vision. It is for all of the above that we have created the Critical Thinking / Think about it! project. to encourage critical thinking and debate regarding the contents of the Internet, that is, to help teenagers in Ordizia and Wiesbaden develop and internalize their critical view of what circulates on the Internet and social networks. Of course, they will not only need a critical view when they circulate on the Internet. But in this project, for the moment, we will limit ourselves to this area; and later we will study whether we can extend it to other areas. Therefore, the objectives that we want to achieve with the project are the following: - Promote critical thinking among young people in Ordizia and Wiesbaden. - Learn to distinguish information based on reliable sources. - Know how to identify sources and contrast information. - Distinguish (and if possible confront) fake news and hate speech. - Learn to search, interpret and integrate the information they need.