Hacker News on 20 June 2013

• This is a web page
• In Head-Hunting, Big Data May Not Be Such a Big Deal
• Edward Snowden: Saving Us from the United Stasi of America
• Hair
• Two dozen mathematicians wrote a 600 page book in 6 months on GitHub
• One cost engineers and product managers don't consider
• The NSA can store communications of US citizens for up to 5 years, sans warrant
• The Internet Just Made Microsoft Kill a Car for a Faster Horse
• LinkedIn suffers DNS hijack
• I Am Bradley Manning