When biologists discover a new species in the 21st century, it's usually because they've run new DNA analysis, peered more closely down the microscope, or collected specimens from far beyond the human comfort zone.
We tend to think of tree resin as an ancient, fragrant defense against munching insects - one that fends off pests and scabs over the wounds left by their voracious mandibles.
The combination drug ceftazidime-avibactam (CZA) is a last line of defense against the common Pseudomonas aeruginosa hospital bug: It's the drug that gets called in when nothing else works, but there's now evidence that it may not keep working for .. ...