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My son Justin is working as a Ruby apprentice for my son Micah at 8th light. We were sitting at the kitchen table, and he showed me a function he was writing. In the midst of the function I saw this: handle_batch(item) and display_batch(item) while items_remaining? I looked hard at this and then I said: “Justin, I don’t think you understand what and does. He said: “I think I do.” and he pointed me to a website which showed 21 Ruby tricks “you should be using in your own code.”