Spinal cord injury treatments, red fire ants and asteroid samples.

Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs.In this week's episode... A breakthrough in treating spinal cord injuries, worrying news about red fire ants in Sicily, we look at what it means for us in the UK and NASA is sending a sample of an asteroid back to Earth - it arrives this weekend - find out what scientists are hoping to learn. Get the podcast from the BBC Sounds app.