Hacker News on 22 May 2011

• An Introduction to Data Mining
• A Guide to Stocks & Options for the Startup Entrepreneur (or Employee)
• Byron Sonne’s G20 security focus cost him dearly
• Rails 3.1: Release candidate
• Repairing Corrupted ZIP Files by Brute Force Scanning in C
• None of Us Knows What We're Doing
• Treatise on Font Rasterisation
• What If Drivers Were Hired Like Programmers?
• London Is Gonna Be Pissed, But We Prefer Berlin for Startups
• Woman earns college degree two decades after complete memory loss