well that's was the major inventions: now let's check the 5 most major problem of the current world: 5 MAJOR MOST MOST PROBLEMS OF CURRENT WORLD THAT HUMAN FACING: 1. CELL PHONE-( thousands of accident ) 2. Internet- ( identity theft ) 3.credit card- more people are in debt in rich country 4.tell me which are they.. 5. tell which are they.. this was once on abc with 20/20 I cant remember..can you help me on this matter bahadur..