Much honored Los Angeles sci-fi writer and alternate historian Harry Turtledove writes about time travel in his Crosstime Traffic series. Could he be predicting the future with the sixth book in the series, due out in July? "The Valley-Westside War," which has a wiki here, is expected to follow the storyline of the series, "which covers the adventures of the employees of Crosstime Traffic, an organization which makes its money by sending traders to various timelines to take advantage of the differences between the timelines....The protagonists in each story are teenagers who must come to terms with their new environments." Be cool if they encounter Hiro Protagonist.