“. . . a weed is just a plant growing in the wrong place. Hardy says it wasn’t just the prehistoric Sudanese who valued it. Ancient Egyptians used it to make perfume. It was a staple for some Aboriginal populations.
And it may even have prevented tooth decay. Turns out, the nutsedge produces antibacterial chemicals that inhibit Streptococcus mutans, an acid-producing bacterium that breaks down tooth enamel and cause cavities.”
For the full story: This Dirty Little Weed May Have Cleaned Up Ancient Teeth : The Salt : NPR.