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.

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