A group of American scientists from Binghamton University presented a new development. The problem of the autonomous operation of electronic devices is quite sharp, the development of increasing the duration and recharging of batteries are conducted in different, even seemingly unpromising directions. So, an inexpensive battery was created, which can be assembled in any country. To create one uses a paper used for chromatography, which is coated with silver nitrate and wax. On the back of the paper, a reservoir from conductive polymer is created, inside of which a liquid with bacteria is poured. Then a sheet of paper was folded, and when its surfaces came into contact, due to the metabolism of bacteria, energy begins to be generated. The power of such a battery depends on the number of layers, so with the help of six batteries folded three times, we can achieve 31.51 μW, and with six layers, 44.85 μW. Yes, while this is really not big numbers, which is not enough to charge the smartphone, but it's enough for simple devices, like a sensor that tracks blood sugar.