On using zip codes, and nearly masking the Flint water crisis: http://theconversation.com/how-zip-codes-nearly-masked-the-lead-problem-in-flint-65626 http://th

On using zip codes, and nearly masking the Flint water crisis: http://theconversation.com/how-zip-codes-nearly-masked-the-lead-problem-in-flint-65626 http://theconversation.com/how-zip-codes-nearly-masked-the-l...