Sorry, books and experts.

But a broody doesn’t heat the entire space she and her chicks are in. She doesn’t have night lights under her wings and she doesn’t let them run all over the place after bedtime, eating all night long. She doesn’t wait until they are 7-8 weeks old, or even older, and then put them through integration. She lets them eat whatever she finds - dirt, germs, seeds, bugs and all. She lets them drink out of mud puddles or water collected on sidewalks, with no additives. She provides them a warm, dark place to hide if she warns them about something or if they get spooked. They run all over their environment, on dirt, exploring and learning how to be chickens, and they regulate their own comfort level by ducking under her for a quick warmup, then they’re back out in the chilly air again.
All of that made me wonder......If a two pound hen can do it without all of the “help”, why do we do it so differently and think we’re doing it better? So I put away the books and pulled out my common sense. I duplicate the real experts as closely as possible. And suddenly I’m not stressed, the chicks are calm and confident, and we’re all happy.