Marnie Chesterton & Victoria Gill embark on a science-themed version of the classic Christmas song ‘The 12 Days of Christmas’ in this festive edition of BBC Inside Science. Twelve of the biggest moments of the year in science include discussion about a very special treefrog discovered in the Ecuadorian Andes. We also hear about two new promising drugs for Alzheimer’s disease. An astronomer and visualisation scientist tells us about three new sonifications of space data. There’s more on the discovery of a 476,000 year-old wooden structure found earlier this year in Zambia and how it has changed archaeologists' understanding of ancient human life. The year has also seen 5,000 new species discovered in a deep ocean abyssal plain. Saturn has 62 new moons and is now the planet with the most moons in our solar system. A report was published deeming 75% of UK rivers as posing a risk to human health. We gathered together experts from Natural Resources Wales, Cardiff University, Bangor University and the Wye and Usk Foundation who discussed why the help from citizen science is essential for their work. And a new record has been set which is really worrying scientists - the highest average global ocean surface temperature, which reached 20.98 degrees centigrade. Other notable moments from the year include: a Japanese twelve-legged robot, eighteen video-calling parrots, proposals for the 10km long Einstein telescope and the theory behind why one player in every football team views the world slightly differently. To help us along the journey the BBC’s Radio Drama Company put all the science together into a brand-new rendition of the well-known 12 days of Christmas song. Presenter: Marnie Chesterton & Victoria Gill Producer: Hannah Fisher Assistant Producer: Emily Bird Editor: Richard Collings Production Co-ordinator: Jana Bennett-Holesworth  BBC Inside Science is produced in collaboration with the Open University.