Some of our best science stories from 2014. Comet landings, Ebola outbreaks, retracted stem cell studies, faecal transplant capsules and more!

Rosetta arrives at the comet, an uncontacted tribe gets influenza, and a bacteriophage is the most common virus in your body. Plus, how bears overeat but don’t get diabetes, a year long microbiome study, and crazy octopus sex!