It is incredible the changes that have occurred since 1900. Technology, travel, space travel, communication (internet, advances in telephones etc). Nearly everyone owning telephone, mobile phone, car, television, microwave. Eradication of many diseases. All these things in just over 100 years. What things do we in 2009 think could never happen that might well come to pass in 100 years time? There must be things we would think impossible now as people in 1900 would have thought some things impossible, but did happen.