Nowadays it's no big deal for a girl to travel 75 miles. But when Charlotte May Pierstorff wanted to cross the Idaho mountains to see her grandma in 1914, it was a very big deal indeed. The railroad was the only way to get t here, and a train ticket would have cost her parents a full day of pay. 
 
Read about the true story of how May got to visit her grandma, thanks to her own spunk, her father's clever plan, and the U.S. Mail.