"What would happen if history could be rewritten as casually as erasing a blackboard? Our past would be like the shifting sands at the seashore, constantly blown this way or that by the slightest breeze."
Michio Kaku

"I have noticed even people who claim everything is predestined, and that we can do nothing to change it, look before they cross the road."
Stephen Hawking.

These parallel universes are not ghost worlds with an ephemeral existence; within each universe, we have the appearance of solid objects and concrete events as real and objective as any."
Michio Kaku

"Meeting an advanced civilization could be like Native Americans encountering Columbus. That didn't turn out so well."Stephen Hawking