The Advent Calendar contains 24 exciting experiments for the advent calendar countdown to Christmas 2021 And Halloween 2021 from The Purple Cow. A different experiment is hidden in each box and each day for science enthusiasts staying engaged with the game for hours. Each block is different from Chemistry and Biology to Mechanics, Optics and Magnetics. All necessary components include a manual with step-by-step instructions. Experiments can also be carried out without prior knowledge.