Hacker News on 20 January 2009

• Ever wonder what the Wikipedia database schema looks like?
• My Git Workflow
• Ask HN: What is your favorite TED talk?
• SICP in PDF from MIT
• Hungry start-ups (Anyvite & TicketStumbler) on a drastic diet
• Whitehouse.gov Has A New Face
• Obama's New Robots.txt
• DIY DNA: One Father's Attempt to Hack His Daughter's Genetic Code
• How VCs Block Exits
• Ruby Warrior: Coding game designed to teach Ruby and A.I.