I loved to spend time by the river of my youth and I loved to think about time as I watched my river meander without concern and I like how Dr. Kaku responded to a question about time travel.
Dr Michio Kaku: Time is like a river. It bends and flows around the Universe. Time may also have whirlpools and also may fork into two rivers. In this way, time travel might be possible. However, you have to have the Plank energy to create a time machine or the energy of a Black Hole. That is far beyond our technology.
Beyond our present technology perhaps, beyond our dreams, never.
Whirlpooling for a season,