Hacker News on 7 June 2010

• Why I Sold Zappos
• Unix toolbox
• Racket
• Math library functions that seem unnecessary
• How I Built an Apartment Buzzer for Multiple Roommates
• Iphone 4.0 official video
• Liquid particles in HTML5
• Daring Fireball: iPhone 4 Impressions and Observations
• Steve Jobs live from WWDC 2010
• We Lose A TechCruncher To Y Combinator