Antibiotics have been saving human lives since the drug Salvarsan was discovered in 1932. Penicillin went into mass-production in 1942. This is not a long time when you think about it, but a world without the protection offered by them already seems unimaginable. Not only have they offered protection from diseases such as tuberculosis, and stopped infections following injury or childbirth, they have also allowed us to develop surgical techniques requiring immune system suppression such as organ transplants. However, careless use of antibiotics has accelerated evolution of drug-resistant bacteria such that we are about to lose their protection.