 And compare the concentrations by tampon characteristics. I guess maybe somewhere there's a rating of your tampon brand. They use mass spec to determine concentrations of arsenic, barium, calcium, cadmium, cobalt, chromium, copper, iron, manganese, mercury, nickel, lead, selenium, strontium, vanadium, and zinc. And by the way, some of these things are not harmful, like zinc. Massive amounts are not a problem. But there's some baddies here. Cadmium.