Penicillin: breaking the mould 2016-09-22

OK, well, we'll see if you're right or wrong later on in the show. Now, penicillin is a common antibiotic – or substance that kills microorganisms – that acts very effectively against certain bacteria. And it was discovered in 1928 by a Scottish scientist called Alexander Fleming who noticed some mould growing on a petri dish of bacteria in his lab, which had a halo – or circle – around it where no bacteria were growing.