Hacker News on 19 January 2017

• Google Has Started Penalizing Mobile Websites with Intrusive Pop-Up Ads
• NHTSA’s full investigation into Tesla’s Autopilot shows 40% crash rate reduction
• Removing Python 2.x support from Django for version 2.0
• Stepping into math: Open-sourcing our step-by-step solver
• Too much sitting, too little exercise may accelerate biological aging
• How Discord Stores Billions of Messages Using Cassandra
• How Do You Measure Leadership?
• Staying with the US Digital Service
• Don’t Tell Your Friends They’re Lucky
• Introducing ProtonMail's Tor hidden service