Hacker News on 20 April 2009

• Oracle to buy Sun
• Stephen Hawking 'very ill'
• Why it is so hard to stay focused these days—and what to do about it
• Underbelly: What haughty startup bloggers don't tell you
• Atlassian Confluence $5 for 5 users
• The Great Brazilian Sat-Hack Crackdown
• Twitter and Posterous
• ISP modifying .torrent file contents to add local seed
• Peeping into Memcached
• The Google Bay