Do you know how to drive a car and all its parts and can you repair one without (too much) outside help? You know many people don't have a car or even drive but cars and other motor vehicles are really important.
Can you work with electricity? Can you fix the power in your house and I don't mean change a fuse? Do you know how electricity is made and distributed? It's a very valuable tool, you know, and a very dangerous one at that, and you have it around you pretty much all the time.
Do you know how make a book? Lay it out, print it, bind it? There is an enormous amount of books in the world, and it only increases. Books are more than computers.
Ever been in construction work? Can you paint a wall, make concrete, erect the scaffolding, run the power line, or lay down some bricks, and etc?
Do you know medicine? I don't mean "I take aspirin when my head hurts", can you read the ingredients of a random medical good and get a sense of what it does or can you diagnose a random pain in the back by yourself?
Well, come on. I can ask more questions. I somehow doubt you know everything as well as you should. So please, refrain from whining.
Offtopic: CAPTCHA evolved - it asked me which one was the smallest and there was a dropdown of options including Mars, a cabbage and Canada (and various multiples of cabbages - a box, a truckload, 100).