Penicillin: breaking the mould 2016-09-22

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No, Neil. Please keep your socks on. Thank you. Now, the subject of today's show is penicillin, which was one of the first antibiotics to be discovered. So, Neil, can you tell me how many lives penicillin has saved since its first use as a medicine in 1942? Is it… a) 20 million? b) 200 million? Or c) 2 billion?