Joanna Stern’s “AI Vending Machine Dispensed Pure Chaos” (Personal Journal, Dec. 22) reminded me of one of the bedtime tales my father used to tell me when I was a child. The “coffee-machine story” ...

Homelabs are fun and I absolutely love mine. However, it was using way more electricity than it needed, and that was costing me more money every month than I was willing to pay. Here are three ways I ...