On Tuesday it was announced that a paralysed man has been able to walk again after a pioneering therapy that involved transplanting olfactory ensheathing cells (OECs) from his nose to his spinal cord. Darek Fidyka, who was paralyzed from the chest down four years ago, can now walk using a frame.

The treatment, a world first, was carried out by surgeons in Poland in collaboration with scientists from University College London. Watch this week’s video from BBC News, below, to find out more about the therapy.

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