The document discusses a conversation between Jadu and Professor regarding time travel. It contains the following key details: 1. Jadu asks the Professor if it is possible to travel back in time. The Professor responds that time travel is theoretically possible but there are many challenges. 2. They discuss the complexities and paradoxes involved in changing the past like the grandfather paradox. 3. The Professor explains that even if one travels back in time, it may not be possible to change major events from the past as there could be other forces preserving the timeline.

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