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Okabe learns that his microwave will send messages to the past, and discovers a shocking secret when he hacks into the SERN network.
Okabe is visited by a self-proclaimed time traveler and conducts the first successful test of his microwave-based time machine -- using a banana.
John Titor tells Okabe that he can't fully decode the SERN files without an IBN 5100 computer, a rare model that he finds difficult to track down.