A former medical student donated one of his kidneys to his old teacher despite not speaking to her for five years - after making the offer on Facebook.
Ali Golian, 30, was inspired to be a radiologist by teacher Sonia Leonardo, 42, who taught him at King's College Hospital, London, in 2010.
They became friends after he got a job at the same hospital but drifted apart and hadn't spoken for five years when she developed kidney failure. Ali only found out when he noticed a Facebook status from Sonia's sister thanking friends for 'get well' flowers.
He messaged her and she explained her kidneys were failing and she was enduring dialysis five times a day. Find our more about the heartwarming story in the video above.