Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs.

In this week's programme: How hair follicles might hold the key to reversing scars, but not just in skin: in hearts and other organs too; scientists crack how to grow new brain cells in the laboratory dish; and what a mutant from millions of years ago is revealing about how ancient animals mated.

As many of us are taking part in Dry January, we look at the history of booze.