Healthy internal flora — our "microbiota" — perform numerous tasks that affect digestion, immunity, metabolism, even mental health. Life would be quite difficult, perhaps impossible, without them. Read more.
We see them everywhere — in our yards, on the side of the road, sprouting through the sidewalk cracks.
They're the ubiquitous little yellow flowers known as dandelions, and they're one of nature's great survivors, capable of thriving just about anywhere.