Without light there would be no life. For neither photosynthesis nor plant growth would be possible without light. The Earth would be uninhabitable and life unthinkable. But what are the origins of light? What properties does it have? Which new ways of using light are there? Why can too much artificial light be harmful? Researchers in Germany are pursuing some exciting ideas and projects in an attempt to find some answers to these questions. You can also read why a young physicist is so enthusiastic about doing a PhD in Germany, learn about current funding programmes and discover our number of the month.