Third graders travel through time to keep history on track! Abigail loves Mondays, and so does the rest of class 305. That's the day Mr. Caruthers asks them cool questions about history. Today Mr. C asks, "What if Abraham Lincoln never freed the slaves?" Abigail and her friends are ready to put their thinking caps on. But this time Mr. C wants them to do more than put their heads together-he wants them to travel back in time! Turns out the "What If?"...