Hacker News on 6 April 2014

• Visually stunning math concepts which are easy to explain
• Ask HN: Idea Sunday
• The Hypocrisy Of Sam Yagan and OkCupid
• Flickr: Invitations disclosure (resend feature)
• Progress Button Styles
• WebM support on 4chan
• Ask HN: Any hackers over 60? 70?
• Mailr: an open-source webmail client with Gmail-like conversations
• Cryptocurrencies will create a fifth protocol layer
• Alan Kay's Reading List