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http://www.theatlantic.com/video/index/393683/a-brief-visual-history-of-weapons/ From the axe, which originated in 1,000,000 B.C., to today's killer drones, mankind's use of weapons has been varied and incredibly inventive. Weapons have changed history and aided in the rise and fall of civilizations. For example, gunpowder, a Chinese invention, led to the development of cannons and guns-revolutionizing warfare in the Middle Ages and beyond.

"Pearson's record speaks for itself: He had Canada deliver weapons to the French to put down the Algerian and Vietnamese independence movements. Asked in Parliament, Pearson refused to call for Nelson Mandela's release from prison. Pearson backed the mid-1950s CIA coups in Iran and Guatemala. He incited individuals to destroy a Canadian peace group after it called for the outlawing of nuclear weapons. Pearson threatened to quit as external affairs minister if Canada failed to deploy ground troops to Korea."

Historian Dan Snow finds out how one low-tech weapon system in the First World War had a huge impact: barbed wire.

"This lesson introduces technology used in World War One in an interactive and fun way. Students will learn what weapons were important in trench warfare."