Imagine, in the future:
unlimited energy and resources available for pure research - an entire high energy civilization devoted to this single purpose;
the technological ability to record and preserve, thus to "save," every experience and memory of every past organism.
Is this even theoretically possible? Do events and experiences leave a permanent echo that could be detected by sufficiently finely tuned instruments? One theory of ghostly apparitions, like a nun seen walking through a wall at the site of a former convent, is that they are naturally occurring, psychically activated visual recordings of past events. But such a process seems unlikely to operate universally and permanently. Entropy reduces order to chaos and information to noise.
If past events are not detectable in the present, would it be necessary to travel into the past to record them and is pastward time travel even theoretically possible?
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