First estimate, then experiment! What do you think is the temperature at which a skin forms on milk? And after how many minutes do your fingers start to wrinkle underwater? Take a guess - and then conduct the corresponding experiment. Short informational texts will explain the background: Why does milk even form a skin? And why do your fingers wrinkle? With this card set, you can find out. The popular series of 75 super cool experiments has a new twist. Estimation questions about the outcomes of the experiments encourage questioning everyday phenomena. You can try it out without the need for complicated material procurement.