To understand Jon’s obsession, it helps to start with a peculiar biological constraint — a cruel joke, as one scientist put it — at the heart of all life on Earth. It goes like this: All living organisms need the element nitrogen to survive. It’s a key part of proteins, DNA, and RNA. But while our atmosphere is absolutely packed with nitrogen, the one enzyme that can pull nitrogen from the air so that living organisms can actually use it basically falls apart in the presence of oxygen. So even though plants, animals, and fungi are constantly surrounded by nitrogen in the air, they can’t get a hold of it on their own.

The only organisms that can actually pull this off are ones that can survive without oxygen: super simple bacteria and archaea. That means the entire natural world relies on a relatively small number of microscopic species to make nitrogen usable by more complex forms of life.