An astronaut will swab the exterior of the International Space Station during a spacewalk Thursday in hopes of learning more about microorganisms living in space. NASA hopes the samples can reveal how ...

Researchers have compiled a detailed catalogue of bacteria living in cancer metastases. Having analyzed over 4000 tumors, they shed light on the diversity of these co-inhabitants and how they might ...

The original version of this story appeared in Quanta Magazine. Prochlorococcus bacteria are so small that you’d have to line up around a thousand of them to match the thickness of a human thumbnail.