Time travel.

Sometimes in life real tragic events seem to happen one after another. What if you had the ability to foretell these events and intervene and change the course of history. Recently a train for no obvious
reason left a curved track at an incredible speed although the driver was very familiar with the journey.

A plane disappears from its regular route and then a ferry loaded with hundreds of passengers capsizes and even although the was a rescue ship near by and enough time to leave the stricken vessel.
No order to abandon ship was given to the passengers.

Long before these events the thought occurred to me could one travel back in time and make a difference. I have explored that idea in my story Archaeopteryx.