Scientist Nina and her young experimenters discover the amazing ways that things can change and react in the everyday world.

Nina investigates why fingers go wrinkly in the bath - with the help of Felix, her touch neuron. Experimenters Florence and Levi visit Nina in her lab and, using their senses, work out that soaking your fingers in water makes them go wrinkly. Nina does an experiment to show that some things soak up, or absorb, water and when this happens, they get bigger.

Then they all go to visit a circus school and try on clown costumes. The costumes are too big for them, so the material goes all wrinkly. Finally, back in the lab, the children do an experiment with a model of a hand. They discover that water makes the skin on your fingertips get bigger and wrinkle up! Show less