In a hot spring at Yellowstone National Park, a microbe does something that life shouldn’t be able to do: It breathes oxygen and sulfur at the same time.

In living organisms today, complex molecules like RNA and DNA are constructed with the help of enzymes. So how did these molecules form before life (and enzymes) existed? Why did some molecules end up ...

Abbreviations and symbols used in this guideline Executive summary Summary of recommendations Section 1 Introduction Section 2 Methodology of guideline production ...