We live in SciFi—witness this stackable and integrative 3-D paper-based bacteria-powered battery. breaking that down, it's a battery made of paper powered by bacteria. It folds up to the size of a matchbook, and can theoretically supply several microwatts of power. The idea behind it is to make self-contained, "disposable diagnostic device in challenging field conditions such as resource-limited and remote regions." You can read more about it in the abstract posted to ScientificDirect [via Discover-e magazine from Binghamton University].
Check It Out: A Battery Made from Paper and Bacteria