These experiments are designed for mass participation using everyday items at home or in class, anywhere around the world. They aim to enhance science learning and encourage practical investigation. Whether you have a background in science or not, you can use this resource with students of all abilities. Thought has also gone into making sure the equipment involved is widely available, with alternative suggestions for schools less able to source materials. Follow the instructions to discover how much water a hydrogel can hold. Is the rate of absorption always the same? How are hydrogels useful to us in everyday life? By taking part we want you to answer these questions and share your discoveries. Why not also earn a Bronze CREST Award? Find out how in the global experiment instructions. Finally, collaborate with thousands of students from around the world by taking part in our experiment and ask your colleagues to join our project too! :)