re: #3 elizajane

It takes some fundamental mathematical ability to recognize what a tiny number 10,000 is in comparison to 1 billion, and conspiracists don’t have that. It’s like all the fuss about how 3,000 scientists don’t believe in global warming, without reckoning how many adults in America have some claim to be called a “scientist” (like “oh yes, I have a BA in Astronomy, I am a scientist”). 3,000, and in this case 10,000, are insignificantly small.

19K/1.1B = 17ppm. Not percent, parts per million.

EDIT: that quantity of arsenic in soil is considered safe.