Ever since antibiotics were invented, we've known that they come with an expiration date. That's because bacteria, like everything on Earth, evolve. And they are quickly evolving a resistance to the thing protecting us from them.
Alexander Fleming first discovered penicillin by accident in 1928, and ever since then we've been dealing with various types of antibiotic resistance. But it's the recent trend of pan-resistant bacteria - bacteria that's resistant to all forms of antibiotics.
Multi-drug resistant forms of pneumonia, salmonella, tuberculosis, and even gonorrhea have surfaced over the last 5 years. And researchers are scrambling to figure out how we're going to protect ourselves in the age of superbugs.