It’s a bit like giving the soil a DNA test.” A new droplet digital PCR (ddPCR) method quantifies root DNA directly from soil ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Caroline Mullen Caroline Mullen is a writer focused on cleaning and organizing ...

National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...