Experiments (with tag Warning: Sharp - show all) Continue Chromatography Butterflies Snazzy butterflies and the colourful chemistry of inks, brilliant! Did you know that most inks are not made of one but many colours? In this experiment we blend art with science and make a batch of pretty flutterbies! Continue Möbius Valentine's Hearts Make sweet interlocking paper hearts from Möbius strips! Advanced activity. By cutting, gluing and cutting some more we're going to make a pair of pretty Valentine's interlocking hearts! Continue Homemade Universal Indicator Colourfully detect the pH of stuff with red cabbage juice! Different stuff around us (and in us!) tends to be acidic, neutral or basic. In this spectacular colour-changing experiment we test a few liquids for their pH. Continue Floating Compass Make your own compass in minutes and always know which way is North! Did you know that planet Earth has a magnetic field? Did you know that you can turn needles into magnets? With this know-how we'll make our own floating compass! Continue Simple Barometer Predict the weather without even stepping outside! Did you know you can tell what the weather will be without checking the forecast? In this experiment we make our own indoor weather-predicting device!