Hacker News on 12 September 2013

• First Mechanical Gear Found in a Living Creature
• Twitter Files For IPO
• Dropbox opening my docs?
• Putin: A Plea for Caution From Russia
• Black Perl
• Voyager 1 has been traveling for about a year through plasma between stars
• Show HN: Wit – Natural language for your app
• Shot tower
• Cocktails for programmers
• H2 {position: sticky} [video]