This week, Chris and Soroush talk about null, the billion dollar mistake. They talk about its past, its present and maybe even its future. Nice!

enum Brain {case smallcase mediumcase largecase galaxycase universe}

• Liskov Substitution Principle
• Null References: The Billion Dollar Mistake
• Python on Google App Engine
• PEP 484: Type Hints
• The Definitive Reference To Why Maybe Is Better Than Null
• That One Optional Property
• The algebra (and calculus!) of algebraic data types
• Point-Free episode 4: Algebraic Data Types
• Optional definition
• SubEthaEdit