Hacker News on 13 March 2016

• Lee Sedol Beats AlphaGo in Game 4
• I made my own clear plastic tooth aligners and they worked
• Should All Research Papers Be Free?
• Work for only 3 hours a day, but everyday
• Re: Obama on Fetishizing Our Phones
• Ask HN: What are some examples of beautiful software?
• The Next Front in the New Crypto Wars: WhatsApp
• GNU Gneural Network
• Stop Using the Daylight Savings Time
• The Little Book of Semaphores [pdf]