The choir already understands all that. You lost everyone else at the words "lambda calculus". Go into a random PHP shop, and I would be surprised if a single

The choir already understands all that. You lost everyone else at the words "lambda calculus". Go into a random PHP shop, and I would be surprised if a single person would know what lambda calculus is. I'm not complaining about the message, I'm complaining about the language you are using. If you want to evangelize for Haskell, you need to use words that someone who failed out of differential calculus will recognize and understand.