Scientists from Harvard University and Columbia University have developed a new type of electrical generator which is capable of harvesting energy from change in humidity levels via the use of soil bacteria.

The prototype generator, developed by a team of scientists working at Harvard University’s Wyss Institute of Biologically Inspired Engineering, involves the use of rubber sheets plastered on a single side with bacterial spores. The bacterial spores cause the rubber material to deform in response to changing levels of humidity, much…