It's easy to forget that for many around the world, having clean water is a luxury. Globally, at least 2 billion people drink water containing disease-causing bacteria.
Researchers from MIT say you can store these patches at room temperature for months, making them ideal for large-scale shipments to developing nations.
Reptiles don't usually have a sweet tooth, but one iguana's hunger for some cake has resulted in the first documented bacterial infection in a human thanks to its bite.