Look out for these lies with charts

      Chart’s purpose is usually to help you properly interpret data. But sometimes, it does just the opposite. In the right (or wrong) hands, bar graphs and pie charts can become powerful agents of deception, tricking you into inferring trends that don’t exist, mistaking less for more, and missing alarming facts. There's a simple takeaway from all this: be careful when designing visualizations, and be extra careful when interpreting graphs created by others.