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I can't wait for the producers to explain Alpert being able to be in at least 5 decades and seemingly not age. There are only a few theories I can come up with:

a) Faraday is wrong in his timeshift theory and you do not have to exist in both the place that you are and the point in time you're going to. Maybe ties in to finding your constant (though we haven't seen Desmond travel any more, at least not yet)

b) If it is as the producers/writers have said and everything will be explained at the end using mundane, everyday knowledge or science, they may take a "Journeyman" approach and claim tachyon fields are allowing him to time travel (which may tie in to #1)

c) Something I saw on "The Universe" is that at least 1 scientist (at MIT) has indeed built what can be considered a time machine. He's experimenting with light instead of gravitic fields, tachyons, etc., but claims he can watch atoms time travel. The caveat here is that supposedly you can only travel between points where the machine was on. Maybe they'll claim back in the '50s one of these machines were turned on.