diff --git a/README.md b/README.md
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 * [Scott Santens](https://www.weforum.org/agenda/2017/01/why-we-should-all-have-a-basic-income/) - (2017) Why we should all have a basic income
 * [David Rotman](https://www.technologyreview.com/s/603465/the-relentless-pace-of-automation/) - (2017) The Relentless Pace of Automation
 * [Matthew Yglesias](https://www.vox.com/2014/8/5/5970767/case-against-time-zones) - (2014) The case against time zones: They're impractical & outdated
+* [Charles Petzold](http://www.charlespetzold.com/blog/2015/07/De-Obfuscating-the-Statistics-of-Mass-Shootings.html) - (2015) De-Obfuscating the Statistics of Mass Shootings
 
 # Sports
 * [Electric Unicycle Forum](http://forum.electricunicycle.org/) - forum for reviews and discussions related to electric unicycles