Hacker News on 21 August 2014

• Why Racket? Why Lisp?
• The Strange and Curious Tale of the Last True Hermit
• Show HN: A virtual whiteboard for working or teaching remotely
• DocumentDB
• Multi-Datacenter Cassandra on 32 Raspberry Pi’s
• The Harvard Classics: Download All 51 Volumes as Free EBooks
• Biologically extending human vision into the near-infrared: Initial success
• Serendipity – When 2 people listen to the same song at the same time
• RTFM 0day in iOS apps
• Show HN: Duo – a next-generation package manager for the front end