by Alex Neu | Microbes exist in practically every environment on Earth. Some of them can endure extreme cold, heat, salinity, or pH conditions. There are some conditions, though, that seem impossible to withstand. Ionizing radiation is an example. I don’t mean your run-of-the-mill background cosmic rays, but intense, radiation so strong that it shatters DNA. But that seems to be where the bacterium Deinococcus radiodurans thrives.