Scientists analyzing raw dirt DNA recently uncovered a shadowy ecosystem of unculturable microbial dark matter called the Candidate Phyla Radiation, revealing that we are…

A closer look

Science loves to brag about cataloging life, yet we somehow missed the vast majority of it. When researchers stopped trying to grow bacteria in petri dishes and just started sequencing raw DNA straight out of groundwater and dirt, they stumbled onto the biological equivalent of dark matter. The Candidate Phyla Radiation is a massive evolutionary branch of ultra-tiny microbes that cannot be grown in a lab because they lack the genes to make their own amino acids. They survive purely as parasitic hitchhikers on other bacteria, totally rewriting the tree of life overnight.