Slightly off-topic, but I'm a big fan of fixing things, and that often requires a handy tool. I carried a Swiss Army knife for many years, and then Leathermans once they came on the scene. It's remarkable how similar an 1,800 old year Roman tool is to those of today. The other must-have is a small waterproof LED flashlight, but that's a topic for another post.
I've had a life-long interest in science and technology, and have the good fortune to work in a position that brings the two together. This space is where the items I read about that aren't directly related to work end up.