I often think, what if the world ends and all the people who has made come true the new technologies we enjoy today? I mean not even the new technologies like iPhone, just take a radio. Ask around, see if how many people know how to make a radio by themselves? So, let's say there is a catastrophe and all these engineers die and only people with no knowledge of any of these inventions survive. Then we will have to go back to whatever we started from, won't we? We wouldn't have anything to make fire, so we might use some stones or tree branches to light a fire; we wouldn't have mobile phones or internet to communicate with others so we might start writing letters. Oh but think about it, we might not even know how to make papers because we are used to buying them at stationary stores. This is why sometimes I get afraid of all the new technologies. They come out, and people master how to use it, not how to make it, and enjoy their new life with high-tech. But this is just making people stupid and more and more reliable to everything the scientists or engineers have created. If they are gone, we can be a baby kangaroo who just came out of the mother's pocket, not knowing anything or what to do without it. I feel we need to educate ourselves, not wasting time and money on useless things.