The Accidental Time Machine by Joe Haldeman
In the not too distant future, Matthew Fuller is a graduate research assistant at MIT. When he pushes the reset button on a calibrator he’s working on, it disappears and reappears seconds later. Naturally, his professor isn’t watching and is more concerned about Matt’s state of mind, suggesting he go home early. The calibrator is packed up and taken to his apartment where Matt has a confrontation and an epiphany: his girlfriend is leaving him for another man; sitting on his kitchen counter could very well be a time machine.
With the box disappearing at increasingly longer intervals, Matt decides to fashion a video set up, a timer, and a live test subject for the sake of prosperity. He’s hoping for a Nobel Prize and a future filled with fame and accolades. He doesn’t expect the series of strange events that begin propelling him into a future he desperately wants to go back on. Or that he’s probably become the first man in history to go thousands of years without sex.
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