Some theoretical discussions discount the "scientific approach" because we do not (as yet) have time machines to actually witness the events of interest. Not that directly witnessing an event is foolproof either. Court records are full of contradictory eye-witness accounts.
Cognitive scientists have conducted very interesting experiments that should remind us that human observation has it's frailties. Watch the Invisible Gorilla video and others to illustrate that attention deficit can be induced for a variety of reasons.
However, what we have is hindsight - the ability to collect and observe various records to sort out what is consistent and what is not. Not a bad thing at all!
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