It's refreshing to have a time-travel story in which the two main characters really don't give a crap about messing up the time-line and also breaking other "time" rules. The first experiment involves Doctor Cordbin Quinn sending a satellite back in time, which transmits video of the Civil War. Then it's time for sending humans back. Quinn is accompanies by Danny, an M.I.T. grad who seems a bit more hot-headed. But it's Quinn, who feels he never had a personal life, that goes off the deep end. Or does he? At one point the two guys get separated in time and when Danny finds him-sees that Quinn has set himself up as ruler in Samarkand in the year 1504. And he's brought them technology! Danny figures, "What the hell" and they embark on satisfying their time-travel desires. That is, until they get a note from the future that warns them of their own deaths.
This is a fun book-and will probably make a great movie. Highly recommended.