The mystery of life’s beginnings has long captivated scientists. Central to that search is LUCA—the last universal common ancestor. LUCA sits at the root of the evolutionary tree, where two great ...

Imagine the tree of life. The tip of every branch represents one species, and if you follow any two branches back through time, you'll hit an... Life as we know it descended from a single cell. What ...

All living things on Earth share a common ancestor, but that was 3 to 4 billion years ago. We're mostly more different than ...

Imagine the tree of life. The tip of every branch represents one species, whether you're talking about humans, E. coli, tardigrades, baker's yeast or giant kelp. If you follow any two branches back ...