Only Seven Steps from the Sun

One day in 1969, the protagonist Mike is hit by a taxi. After his recovery, Mike suddenly finds out the surrounding world has been changed completely, so have architectures, automobiles, stores and people. Mike is unable to explain everything that happens currently, and everything is out of his control. Even the era he lives in is also changed. Mike travels from 1969 to 1970. This is an interesting story written by a scientist on how to seek the future.