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The Accidental Time Machine

I love time machine stories! And this one started off pretty good. Guy at MIT finds an accidental time machine, tries to figure out how it works as he deals with a bunch of other things in his life. But then things get weird. He goes so far into the future that things are weird. And then SO far into the future that things are unrecognizable. And there’s this naive gal the protagonist meets along the way who you’re worried he’s going to have an inappropriate relationship with (this is scifi after all). It wraps up neatly but I didn’t like the second half of the book as much as I enjoyed the first half.