Sally M Walker

The Mason-Dixon Line's history, replete with property disputes, persecution, and ideological conflicts, traverses our country's history from its founding to today. We live in a world of boundaries—geographic, scientific, cultural, and religious. One of America's most enduring boundaries is the Mason-Dixon Line, most associated with the divide between the North and the South and the right to freedom for all people. Sibert Medal–winning

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December 6, 1917, started like any other day in Halifax. But everything stopped shortly before nine o’clock that morning, when two ships collided in Halifax Harbour. One of the ships was loaded with munitions for the troops fighting in Europe; the other was preparing to collect medical supplies for the war’s victims.
The resulting disaster was the largest man-made explosion until the detonation of the atomic bomb in 1945. The blast...

Explores what volcanoes are and how they can be both harmful and helpful to human beings.

"When Harry Colebourn saw a baby bear at a train station, he knew he could care for it. Harry was a veterinarian. But he was also a soldier in training during World War I. Harry named the bear Winnie, short for Winnipeg, his company's home town, and he brought her along to the military camp in England. Winnie followed Harry everywhere and slept under his cot every night. Before long, she became the regiment's much-loved mascot. But who could care...