What were Stone Age bacteria like? We already have the first clues
Bacteria have lived on our planet Earth for about 3 billion years, most of the 4.5 billion years the planet has existed. And while hardworking microbes are central to medicine,…
Earth’s first steady dose of oxygen almost ended life
The world was an unrecognizable place more than 2.45 billion years ago. But for most of the small organisms that lived on the planet at the time, things were fine;…