Hacker News on 19 April 2015

• How to Center in CSS
• Fossdroid.com: Free and open source Android applications
• This French tech school has no teachers, no books, no tuition
• United Airlines Stops Researcher Who Tweeted about Airplane Network Security
• Clockmaker John Harrison vindicated 250 years after ‘absurd’ claims
• Lol my thesis – Summing up years of work in one sentence
• DARPA Has Open-Sourced 'Dark Web' Search Tech
• The Missing Mt. Gox Bitcoins
• Google got it wrong. The open-office trend is destroying the workplace
• Homeless Millennials Are Transforming Hobo Culture