Similar to Mary Shelly’s Frankenstein, scientists have discovered a type of bacteria that live only on pure electrons. Found in the seabed, in mud or rocks, these bacteria survive by extracting electrons from the surface of nearby materials, and after processing them and using their energy, they excrete them.
Although it sounds like a very simple and basic organism, its way of life is actually quite smart. In more evolved beings like us humans, we use many complex molecules to obtain energy: sugar and oxygen, which turn into ATP, and all this respiration process to end up with energy for survival. These bacteria manage to eliminate these useless (to them) intermediates, and just function with the basic electrons. They go for the easy route, whilst we masochists use larger molecules when all we really need are the electrons in those molecules.
However, these are not the first bacteria found to have this peculiar lifestyle. Other species, like the Shewanella or Geobacte bacteria do pretty much the same thing, but the novelty in this case is that the new bacteria can be found in large numbers by just applying a slight current through some seabed rocks. The fascinating experiment studied the microbiome of said rocks and analysed it, to determine how much voltage each of the new 8 bacteria species needed to survive. This eventually led to the recreation of those conditions in a culture, using a battery and an electrode to supply the energy to the bacteria. This simple way of life also raised a question: How much do these bacteria essentially need to survive? If all they need is electrons, by constantly feeding them these in a set of electrodes, they could theoretically live forever.
And as always, what some would call ‘greedy scientists’ are looking for ways to earn some profit out of their discoveries. In this case, it’s the possibility of automated biomachines, where these robots could carry out jobs with no necessary electrical input, only their ability to use power from their surroundings.