My dad's hand-me-down Swiss Army Knife (IIRC I was ~8 when he gave it to me). It was one of the larger ones with lots of different tools and I used it to pry th

My dad's hand-me-down Swiss Army Knife (IIRC I was ~8 when he gave it to me). It was one of the larger ones with lots of different tools and I used it to pry things open, unscrew electronics and put them back together, strip wires for repairing devices I may have previously torn apart to vigorously. Also used it for lots of dumb stuff that was kind of dangerous but the blades were no longer than ~100mm so I couldn't do much harm. Made lots of models, primarily fighter jets (F-14, F-15, F-16, F-18) but also a lot of Star Trek ships (a large 1701-D was my baby). Lego as well... Also had a decent microscope and chemistry sets. Teach your kids to make things and explore.