Each day brings a brand-new hands-on science activity to keep kids curious and entertained throughout the holiday season Paper & Video Dual Instructions: Every experiment is equipped with detailed paper manuals and step-by-step video tutorials. 24 Unique Science Experiment: This Christmas advent calendar contains 24 different surprise science experiments, covering classic and popular kids lab projects such as volcano eruption, crystal growing, crystal tree growing, bouncy ball making, submarine volcano and more. Kids can follow clear guidance to complete each project independently without complicated tools or difficult steps.