Electric Play Dough Project 2: Rig Your Creations With Lots of Lights ... Play dough science project: Investigate how to build series and parallel squishy circuits that light up using conductive and insulating play dough. Jump to main content. Search. ... Science Fair Tools; STEM Classroom Kits; Google Classroom; Blog; STEM Calendar; Science Project Help. Topic Selection Wizard ; Ask an Expert; Science Careers.