What is energy, anyway? Where do young trees come from? Children can explore questions like these in 317 teaching events. 515 scientists prepare the content for the children. This year, 40 lectures will focus on the topic of climate. One of them was the opening lecture on Monday at 10:00 am. It is entitled: “Plastic everywhere! Where it’s hiding, where it’s going and what you can do about it”. The speaker was ECH co-director Thilo Hofmann.