Why science matters: Five of the best stories
A potential ebola vaccine, water on Mars, record warming, 3D body parts and the cancer risks involved in eating processed meat all made 2015 science headlines.
What happened to Mars’ atmosphere?
Nasa says the MAVEN spacecraft reveals Mars' atmosphere is blowing in the solar wind, and the stronger the wind is, the more dramatic the loss.
Running water = possibly life on Mars
Discovering liquid water on the Red Planet is a big step towards finding life forms, but don't get too excited just yet - definitive proof is still years away.