Articles from November 2017
![Limestone rock enters Iowa streams as soluble calcium bicarbonate.](/sites/cjones.iihr.uiowa.edu/files/styles/widescreen__1024_x_576/public/2021-08/limestone-rock.jpeg?h=e733b10c&itok=n9Tc79nU)
Billions and Billions
Thursday, November 16, 2017
As we go about our regular lives, a billion of anything seems like a whole lot. For example, if you need to count a billion things, it’s going to take a while. An 80-year lifespan would include only 42 million seconds, not even close to one billion (0.042).