The South African National Blood Services Operations Testing Manager, Charl Coleman talks about how chemical biology researchers at the University of British Columbia in Vancouver, will convert blood type A into a universally acceptable type through the use of human gut microbes. On Unscience, we look at a chilling, rare but extremely distressing phenomenon, where patients were found conscious during CPR. Still on the bloody topic, University of the Witwatersrand Pathology and Haematology professor, Johhny Mahlangu unpacks hemochromatosis, a blood condition that is characterised by the oversupply of iron in the blood, which can be caused by ingesting iron supplements or through regular blood transfusions.