Original image by Eléonore Bommart (CC0)
Scientists know what life does, but what life is. that’s a mystery, says astrobiologist Marcelo Gleiser. But that’s not stopping scientists from creating strange hybrid life forms that challenge our moral boundaries. And Bob Hazen, a renowned geologist known for his pioneering work in the evolution of minerals, has been working on a radically new understanding of how life evolved, which begins not with cells but with rocks.