Scientists use carbon-fiber electrodes (gray) to lure electricity-eating microbes (orange). These microbes grow incredibly slowly, so attracting them can take time. They left this electrode underground for five months.

Yamini Jangir and Moh El-Naggar

Scientists use carbon-fiber electrodes (gray) to lure electricity-eating microbes (orange). These microbes grow incredibly slowly, so attracting them can take time. Researchers left this electrode underground for five months.