Ancient Egyptians used moldy bread on infected wounds and cuts in order to treat some patients, and no one understood why. Until 1928, it was discovered by scientist Alexander Fleming that penicillin had a great effect as an antibiotic on bacteria. When bread is left rot, it secretes a fungus called Penicillium, from which penicillin is derived, most famous antibiotic used so far to treat bacteria known to Egyptians 5000 years ago. #archaeohistories