All the posts are so true, and the one from skymaster is priceless.
I taught my boys how to build, repair, take things apart and put them back together (sometimes I wish I hadn't taught my oldest one how to take things apart).
In talking with my grandson a few years ago, he couldn't imagine my making a slingshot from a tree branch or a scooter from a couple of boards and old roller skate wheels. He thought you only bought them already made. Guess my son didn't understand the part about "making it yourself" and teaching his son.