weeds

They are the weeds that sprout in sidewalk cracks, the elaborate graffiti that enlivens the drab wall of an abandoned building.

Siblings Alex and Keeley regularly visit their dad's grave in a peaceful Essex cemetery to remove weeds and lay new flowers.

They start to secrete renin and substances that trigger other changes: New nerves grow like weeds; immature smooth muscle cells build up; scars form around the tiny blood vessels, called arterioles; and inflammatory cells infiltrate.

A few years back, a group of weed scientists showed that soil-applied herbicides are less effective against agricultural weeds in the context of our changing climate.

“We were fully in the weeds, which was wonderful and it was really important,” he says of the process.